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Open Access Article
1 - Optimum use of water resorce Auramanat zone(Rain Reservoir)
پرویز kardovani Bakhtir KurdpoorConstrains and low water sources, most societies demand for water consumption need to increase the exploitation of water resources in 2025 to rate 110% of indicators based on national and international water management in iran, caused of optimation use of rain water. St MoreConstrains and low water sources, most societies demand for water consumption need to increase the exploitation of water resources in 2025 to rate 110% of indicators based on national and international water management in iran, caused of optimation use of rain water. Storage to be considred. In this study, the first for supply water of javanroud weather station, in experimental case of 6000 litter tank rainwater stroge, averagly from rainwater on popularization level about lo time, full and depleted annually, with successfully case of study, decided that in grater scale to purpose of pupularization water supply in industry and agriculture. And overview normal standard use of 150 m3 for one family animaly , build a reservoir 8*7*3 m2 with a capacity of 150 m3 cubic meters of pond surface is 250 m2 action. In this area over the water years with normal rainfull 600 mm every 100 square meters, 60 cubic meters of rainwater storage was used successfully. Reduced rainfull in recent years, before the rain evaporated and runoff out of reach water harvesting methods can help, especially with rain water stroge reservoirs, shoud be used and esploited. With this study with out need to fountiain. Well and river water, surrender from proximity and distance to other water resources, every demaned water needed from an area, in proximity of that area ease supplied. Manuscript profile -
Open Access Article
2 - The Effect of Deficit Irrigation Management and Nitrogen Fertilizer Levels on Yield and Water use Productivity in Soybean
Amir Nikakhtar Ali Neshat Najmeh YazdanpanahBackground and Aim: The deficit irrigation method with the aim of saving water consumption can be presented as a useful strategy in low water conditions and with the proper use of the amount of water consumption. Optimum use of water and proper use of fertilizer, in add MoreBackground and Aim: The deficit irrigation method with the aim of saving water consumption can be presented as a useful strategy in low water conditions and with the proper use of the amount of water consumption. Optimum use of water and proper use of fertilizer, in addition to increasing plant yield, increases the water productivity and fertilizer. Nitrogen is one of the main elements in plant nutrition, because of its importance in the plant's vital processes; its deficiency reduces performance more than other elements. The present research was conducted with the aim of investigating the effect of water stress and different levels of nitrogen fertilizer on the yield and productivity of Williams cultivar soybeans in Hormozgan province.Method: This experiment was conducted in the form of split plots in the form of randomized complete blocks in three replications in Hajiabad city (Hormozgan province) in two crop years 2021 and 2022. The main factor was irrigation in 6 levels without irrigation and providing 40, 60, 80, 100 and 120% of water requirement and the secondary factor was the amounts of nitrogen fertilizer (urea source) in four levels including zero, 50, 100, 150 and 200 kg/ha. Each experimental unit had dimensions of 5×20 m2 and had 10 cultivation rows.Results: The interaction effect of irrigation and nitrogen fertilizer on biological, pod and seed yields, harvest index, thousand seed weight, number of seeds per plant, pod length, water consumption efficiency in biological, pod and seed were significant at 1% level. The interaction effect of irrigation and fertilizer showed that the highest amount of biological, pod and seed yields in the conditions of 100% water requirement and 150 kg N/ha consumption were 6051, 4941 and 3049 kg/ha respectively. The maximum harvest index due to the interaction effect of irrigation and nitrogen fertilizer was in the conditions of 100% water requirement and with 100 and 150 kgN/ha fertilizer with an average of 0.43%. The interaction effect of irrigation and nitrogen fertilizer showed that the maximum thousand seed weight was with 120.8 g in the condition of 100 percent water requirement and fertilizer consumption of 200 kg/ha. The highest efficiency of water consumption based on biological, pod and seed yields were observed in conditions without irrigation and 150 kg N/ha in the amount of 5.61, 3.71 and 2.28 kg/m3 respectively.Conclusion: According to the results, the availability of water and sufficient nitrogen are two very important factors that affect the growth and yield of soybean. Therefore, in addition to the lack of water, the lack of nitrogen also causes stress on the growth and yield of soybean. With the upward trend of nitrogen fertilizer consumption, the yield decreased and if there is not enough water, the increase in nitrogen fertilizer consumption aggravates the effect of moisture stress and as a result the yield of the plant decreases, therefore, in water shortage conditions, Excessive use of nitrogen fertilizer is not recommended. According to the results, full irrigation and nitrogen consumption up to 150 kg/ha are suggested for the studied area. Manuscript profile -
Open Access Article
3 - Evaluation management strategies to reducing agricultural water use (Case study: Marvdasht-Kharameh study area)
omid raja masoud parsinejad teymor sohrabiIrregular exploitation of water resources of the country, especially in the agricultural sector, has threatened Iran with serious threats. The main objective of this study is to provide of possible management strategies at farm level, without changing irrigation systems MoreIrregular exploitation of water resources of the country, especially in the agricultural sector, has threatened Iran with serious threats. The main objective of this study is to provide of possible management strategies at farm level, without changing irrigation systems and additional costs in order to reduce agricultural water consumption such as improving irrigation water efficiency, changing the planting date and studying different levels of deficit irrigation with regarding the type of cultivation, the actual conditions of irrigation management (amount, number of irrigation, etc.) in different areas of the study area have been checked. The basics of the study are based on actual information and in the form of a case study. . The results showed that improvement of irrigation efficiency for dominant crops in two regions of Dorodzan and Korbal, leading to savings in water allocation of 131.5 (11.2%) and 33.8 (10.83%) million cubic meters, respectively. The results of the scenario of change in planting date using AquaCrop model simulation showed that with this management pattern could be saved, 31.6 (2.7%) and 9.17 (2.94%) million cubic meters in the two regions of Dorodzan and Korbal in water consumption respectively . At the same time, different levels of deficit irrigation can save 85.5(7.3%) and 26.2 (8.4%) million cubic meters in water consumption respectively. Manuscript profile -
Open Access Article
4 - Assessing the Performance of WRF Model in Prediction of Evapotranspiration in Paddy Fields
Ebrahim Asadi Oskouei Mohammadreza Mohammadpour Penchah Leila Goodarzi Mojtaba ShokouhiBackground and Aim: Evapotranspiration as one of the main components of the hydrological cycle, has a significant role in proper irrigation planning and water resources management. In this case, estimating evapotranspiration is limited due to a lack of data and a defici MoreBackground and Aim: Evapotranspiration as one of the main components of the hydrological cycle, has a significant role in proper irrigation planning and water resources management. In this case, estimating evapotranspiration is limited due to a lack of data and a deficiency of meteorological stations. Therefore, today numerical models such as WRF are a powerful tool for generating and predicting meteorological quantities (wind speed, humidity, etc.) that are needed to estimate evapotranspiration. So far, no research has been conducted to investigate the effect of different schemes of the WRF model on the estimate of rice evapotranspiration. The purpose of this study is to evaluate the efficiency of the WRF model and obtain the result for estimating evaporation for rice plant in the central plain of Guilan.Method: Evapotranspiration rates vary from 2.7 to 8.5 mm per day. The average ET during three different periods of plant growth, including the initial, middle, and final periods, is estimated to be 4.63, 5.97, and 5.98 mm per day, respectively. The three configurations 1, 2, and 4 are mainly overestimated in predicting evapotranspiration of rice plants, and the computational values are estimated to be higher than the values measured by the lysimeter. The results show that the highest amount of RMSE occurred in configuration No. 4 at 8.47 and the lowest rate occurred in configuration No. 3 at 1.26. Summary of results shows that configuration No. 3 in all four criteria mentioned has performed better than other configurations to predict daily evapotranspiration of rice. The results showed that the non-local schema used in the model, simulates better than the local schemas for the daily evapotranspiration of the rice plant. Findings show that in the local YSU schema, the accuracy of predictions is significantly increased and is only 0.64 mm on average less than the estimated lysimetric data.Results: The results showed that using appropriate schemas in the surface layer and boundary layer of the WRF model, affects on accuracy of evapotranspiration predictions. The results of this study showed that, this model by using the YSU non-local boundary layer scheme can accurately predict the evapotranspiration rates of the rice plant for the next day and this is due to the higher ability of this schema in predicting the parameters affecting evapotranspiration (including temperature and wind). Therefore, the WRF model can be implemented by using GFS forecast data for the next few days and by applying the FAO-Penman-Monteith equations to the model outputs, the values of potential evapotranspiration for different regions of the country can be calculated. Since evapotranspiration is directly related to atmospheric thermodynamic processes, so using other different atmospheric physics schemas (not considered in this study) can produce different results. Manuscript profile -
Open Access Article
5 - Estimation of Evapotranspiration Using Reanalysis Models based on Global Earth Observations at Distinct Climate Regions of Iran
Asghar Azizian bahareh bahman abadi Mahnoosh JenabAccurate estimation of evapotranspiration is one of the most important issues in water balance calculation at the catchment and field scale. The lack of meteorological observations for using empirical methods and the high costs of measuring evapotranspiration using lysi MoreAccurate estimation of evapotranspiration is one of the most important issues in water balance calculation at the catchment and field scale. The lack of meteorological observations for using empirical methods and the high costs of measuring evapotranspiration using lysimeter restricts the usability of these methods in most cases. To tackle these problems, this research addressed the performance of reanalysis models including W3RA, HBV-SIMREG, PCR-GLOBW, WATER-GAP, and Ensemble for estimation of evapotranspiration at different climate regions of Iran. Besides, the reference evapotranspiration for assessment of the above models obtained using lysimeter measurements. Findings showed that in most cases studies the Ensemble model’s performance with the RMSE value ranges from 3.42 to 7.57 mm/day is the weakest one, while the results of HBV-SIMREG and W3RA show the best agreements with lysimeter dataset. Analyzing the outputs based on mean bias error (MBE) depicted that the estimated evapotranspiration based on W3RA and Ensemble have the minimum and maximum bias, respectively. As an overall conclusion, although results indicate that PCR-GLOBW has the maximum correlation coefficient (CC) with the reference datasets, HBV-SIMREG is the best and reliable model for estimation of evapotranspiration in most climate regions of Iran and can be considered as an alternative dataset, especially in data-limited areas. Manuscript profile -
Open Access Article
6 - Estimation of water requirements of Robinia pseudoacania and Ailanthus altissima Mill For afforestation under different water stresses (Case study: Robat Karim town)
Mohammad Asgari Vahid Etemad Abdolmajid Liaghat Pedram Attarod Mohsen Javanmiri PourSince the creation of green space depends on the availability of water and dedicated water for irrigation of urban green space, green belts and afforestation in arid and semi-arid climates. Water availability has great value and should be used optimally with high effici MoreSince the creation of green space depends on the availability of water and dedicated water for irrigation of urban green space, green belts and afforestation in arid and semi-arid climates. Water availability has great value and should be used optimally with high efficiency. For this reason, in order to save water, planting species that need less water and at the same time have optimal growth efficiency has always been as an executive policy. The aim of current study is to estimate the water requirement of tree species in the field and greenhouse under different water stresses in Robat Karim town of Tehran province. This research has been done in both space of greenhouse and field by saplings of Robinia pseudoacania and Ailanthus altissima Mill and it was done in a completely random design in the field and greenhouse. This research has two stages and each stage consists of several phases. In the first stage, respectively soil field capacity, determining of MAD, determining water requirement of saplings through evapotranspiration were examined and in fact, by determining the water requirement of saplings, the irrigation cycle was determined. In the second stage, the studied saplings were subjected to water stresses 2, 4 and 6 days after reaching MAD and at each period, the physical characteristics data of the saplings were collected. Generally, the results of this study have shown that Robinia pseudoacania has a higher water requirement and more irrigation cycles in the field and greenhouse than Ailanthus altissima Mill. Manuscript profile -
Open Access Article
7 - Investigating the impacts of latitude on virtual water content of major crops in the eastern provinces of Iran
Ali Arefinia Khaled AhmadaaliTemperature is a key factor in yield, crop water requirement, and then virtual water of various agricultural products. Therefore, it is necessary to investigate the effect of latitude as one of the most effective factors on the variation of virtual water of agricultural MoreTemperature is a key factor in yield, crop water requirement, and then virtual water of various agricultural products. Therefore, it is necessary to investigate the effect of latitude as one of the most effective factors on the variation of virtual water of agricultural products. In this research, the virtual water content of nine major plants including wheat, barley, alfalfa, sugar beet, corn, watermelon, tomato, onion and potato in four eastern provinces (including 56 cities) of Iran was calculated based on 20-year statistical data. Then, the average virtual water of each plant was calculated in different latitudes from 〖25〗^° to 〖38〗^°N at 1^° intervals using ArcGIS software. The regression between the average virtual water with crop water requirement and yield of the products revealed a positive correlation between virtual water and crop water requirement (r=0.65) and a negative correlation between virtual water and yield (r= 0.74). The average virtual water from the lowest to the highest was 0.19, 0.38, 0.45, 0.46, 0.53, 0.57, 1.59, 1.69, and 1.80 thousand cubic meters per ton for corn, sugar beet, onion, watermelon, tomato, potato, alfalfa, barley, and wheat, respectively. The results showed that the variation pattern of virtual water of the studied products across different latitude was Gaussian. Despite the different maximum values of virtual water, they occurred in the latitude range of 〖30〗^° to 〖33〗^° N and by moving away from the mentioned range to higher or lower latitude, the virtual water content of all products decreases. Manuscript profile -
Open Access Article
8 - Investigating Performance, Water Productivity, Growth Degree Day Index (GDD) and Evaluating Yield Response Factor of Safflower Plant Under Different Irrigation Treatments
Arash Tafteh Saloomeh Sepehri Aslan Egdernezhad Ali Abdzad Gohari Parisa ShahinrokhsarBackground and Aim: Because safflower contains more than 90% of unsaturated fatty acids, it can play an important role in expanding the area under cultivation of oilseeds and providing oilseeds in the country. Considering the lack of water and the need to investigate th MoreBackground and Aim: Because safflower contains more than 90% of unsaturated fatty acids, it can play an important role in expanding the area under cultivation of oilseeds and providing oilseeds in the country. Considering the lack of water and the need to investigate the behavior of the safflower plant in low irrigation conditions, it is necessary to have a proper estimate of its performance under water stress conditions. This oilseed plant needs areas with little winter and spring rainfall during the flowering period and is drought tolerant and has long roots with a high ability to absorb water from deeper soil profiles. Method: In order to estimate the yield production function and yield components of safflower plant variety Sina under water stress conditions, an experiment was carried out in a research farm located in Kermanshah province. This research was conducted using the data collected in two crop years in a research farm in Kermanshah. The yield response factor was implemented at three levels of 70, 60 and 30% of water requirement based on soil moisture balance in three iterations. Based on the data of the first year, the two production functions of Raes and Tafteh, yield response factors of the plant were determined and evaluated using the data of the second year. To calculate the growth degree day (GDD), two methods of direct calculation and modified average were used. The maximum possible temperature for growth is about 30 degrees and the minimum temperature for growth is 0 degrees as the recommended and acceptable low limit (no trend). In this research, the maximum value of 30 degrees and the base temperature value of 4 degrees were taken from the water requirment system database(niwr.ir). Then different periods of phenology were calibrated with this index. Also, the relationship between GDD index and transpiration evaporation coefficients and yield response factors and irrigation requirement were investigated. Results: The findings showed that the yield response factors of safflower plant to water stress varies between 0.5 and 1.2 in different growth periods and the highest sensitivity is in the flowering period and the middle period of this plant. Also, the results of the investigation of the two production functions showed that the values of the statistical indicators for both functions are the normal error value of 5% and the efficiency value of both functions is about 97%. The results show that the lowest average evapotranspiration in different treatments was related to the 30% water requirement treatment with 189.8 mm and the highest was related to the 100% water requirement treatment with 632.7 mm. Conclusion: Based on the obtained results, the Sina safflower plant is most sensitive to dehydration in the middle and flowering stages, and the yield response factors reaches its maximum in this stage (about 1.2) and water stress is not recommended at this stage. On the other hand, Rees and Tafteh function with the presented yield response factors can estimate the results with acceptable accuracy in water stress investigation based on the presented coefficients. On the other hand, in the absence of plant data and complete meteorological data, only by using the GDD index can evaluate the values of plant coefficient and plant sensitivity to water stress and plant irrigation requirement with appropriate accuracy. Manuscript profile -
Open Access Article
9 - Estimation of Wheat Irrigation Water by Inverse Solution Method of the Production Functions under Water Stress Conditions Using NIAZAB System
Niazali Ebrahimipak Ali Abdzad Gohari Arash TaftehBackground and Aim: Different factors are effective in increasing wheat production, one of the most important of which is water. Determining the actual consumed water of wheat in arid and semi-arid regions is of particular importance and the economic use of water is a s MoreBackground and Aim: Different factors are effective in increasing wheat production, one of the most important of which is water. Determining the actual consumed water of wheat in arid and semi-arid regions is of particular importance and the economic use of water is a serious and very important issue for farmers and researchers who cultivate and produce wheat under irrigation. The season of wheat cultivation has a direct effect on its water requirement due to the change in the energy pattern affecting evapotranspiration, and it will definitely have a lower water requirement in winter than in spring and summer. Therefore, the present study was conducted in order to investigate the water requirement system in determining the actual amount of irrigation water and wheat plant yield based on the inverse solution of the production function under water stress conditions for Alvand variety wheat in Qazvin province.Method: The research was conducted in 2017-2019 crop years in Qazvin province on a land of 600 square meters in Esmailabad research station (49º 52' N, 36º 15' E, 1285 MSL). The experimental design was in the form of split plots and in the form of a randomized complete block design with three replications. So that the main factor of irrigation management includes providing water requirements of 20 (I1), 40 (I2), 60 (I3), 80 (I4) and 100 percent (I5) and secondary treatment includes irrigation until the end of the flowering stage (S1) and The pulping of the seed was (S2). The country's using NIAZAB system was provided by the Soil and Water Research Institute (SWRI). This system is designed to determine the water requirement of farmland and Orchard products, which has the ability to estimate and determine the water requirement, Consumed water and plants irrigation planning at the level of the region, city, catchment and plain. One of the prominent points of this system is its location-based nature, and the user can extract their regional needs by referring to the system and can allocate the water used for the cultivation pattern under different usage options to the beneficiaries of the agricultural water stakeholder with the ability to provide an update.Results: The results showed that the root mean square error in Tafteh, Pasquale and Raes methods was 122, 83 and 126 mm per day, respectively, and Pasquale method had a better estimation than other methods. In Pasquale's method, the best normalized root mean square error was observed with 0.18%. The index of agreement or consistency in Tafteh, Pasquale and Raes methods was 0.95, 0.98 and 0.95%, respectively, and the Coefficient of Efficiency of the model was 0.77, 0.91 and 0.73, respectively. The results of the statistical analysis showed that the measured and simulated values are close to the 1:1 line and have a good relationship, and the coefficient of determination values in the studied years showed 0.98. The results of estimation the amount of wheat plant evapotranspiration in the using NIAZAB system in the Qazvin plain with the methods of Tafteh et al. (2013), Pasquale et al. (2017) and Raes et al. (R2=0.98) were high and the root mean square error in Tafteh, Pasquale and Raes methods was 120, 83 and 126 mm per day, respectively, in which Pasquale's method had a better estimation than other methods.Conclusion In general and according to the statistical results, a good approximation was observed between the real data and the using NIAZAB system in determining the amount of irrigation water under water stress conditions, which indicates the appropriate evaluation of the water requirement system and the ability to simulate the wheat yield function in relation to different treatments. It was irrigation and this system can be used as a suitable tool in estimating water needs to improve water management in wheat. Manuscript profile -
Open Access Article
10 - Determining the Amount of Water Use and Evapotranspiration of Bean Using Tafteh, Pasquale and Raes Methods under the Conditions of Drip and Furrow Irrigation
Ali Abdzad Gohari Fatemeh Keykhaei Niazali EbrahimipakBackground and Aim: Due to the limitation of water resources, proper use of water is necessary, and the use of appropriate irrigation methods in fields is an appropriate strategies to use water. Water stress can affect crop yield in the field. Therefore, the correct met MoreBackground and Aim: Due to the limitation of water resources, proper use of water is necessary, and the use of appropriate irrigation methods in fields is an appropriate strategies to use water. Water stress can affect crop yield in the field. Therefore, the correct method of irrigation and management of water consumption is one of the basic issues in farms. The deficit irrigation strategy with the water requirement supply approach can be considered as a practical and efficient technique to ensure more crop yield, without compromising the physiological processes and yield. Therefore, the scope of this research is to estimate the amount of water consumed and the amount of evapotranspiration of the bean plant with the aim of evaluating the field conditions and comparing it with Tafteh, Pasquale and Raes methods. Method: The present study aims to determine the amount of water use and evapotranspiration of bean using Tafteh, Pasquale and Raes methods and based on the inverse solution of the yield production function in Markazi Province and at the Khomin Bean National Research Station at an altitude of 1930 meters above sea level with a length of 49 degrees and 57 minutes of latitude and 33 degrees and 39 minutes of latitude were implemented in 2016 and 2017. In this experiment, the irrigation treatment including furrow and drip-tape as the main factor and, the values of water requirement including 100, 75 and 55% of water requirement as a sub-factor and in the form of split plots in the form of randomized complete blocks design were done in three replications. Cultivated variety was of native type and its planting time was on the 10th and 9th of June respectively in the first and second year. Drip irrigation tapes were placed on the stacks and irrigation was carried out in the same way until the seedling was fully established in the stage of emergence of the third three leaves. Results: The highest seed yield with an average of 2683 kg/ha was obtained in the furrow irrigation method and by providing 100% of the water requirement. In evaluating evapotranspiration, the root mean square error (RMSE) in Tafteh, Pasquale and Raes methods were 0.160, 117.8 and 0.185 mm respectively and the root mean square normal error (RMSEn) were 0.448, 0.330 and 0.518 percent respectively. The index of agreement or compatibility (d) in Tafteh, Pasquale and Raes methods were 0.295, 0.600 and 0.081% respectively. In the investigation of irrigation water amounts, the root mean square error (RMSE) in Tafteh, Pasquale and Raes methods was 156.7, 117.5, and 181.3 mm, respectively, and the root mean square normal error (RMSEn) was 0.446, 0.335 and 0.516 percent respectively. The index of agreement or compatibility (d) in Tafteh, Pasquale and Raes methods were 0.324, 0.602 and 0.118% respectively. Conclusion: In general and according to the statistical results, Tafteh, Pasquale and Raes methods had an acceptable estimate of the amount of irrigation water and the amount of evapotranspiration in the furrow and drip conditions under different amounts of water requirement. Therefore, they can be used as appropriate tool in the estimation of water use in the studied area. Manuscript profile -
Open Access Article
11 - Simulation of yield and water use productivity in soybean plant under deficit irrigation and different levels of nitrogen fertilizer conditions using DSSAT model
Amir Nikakhtar Ali Neshat Najmeh Yazdanpanah Ali Abdzad Gohari Ebrahim AmiriBackground and Aim: Water and fertilizer stress have a negative effect on many physical and chemical processes related to the efficiency of water productivity in soybean, thus leading to a decrease in the yield and quality of the plant. Predicting yield response for eva MoreBackground and Aim: Water and fertilizer stress have a negative effect on many physical and chemical processes related to the efficiency of water productivity in soybean, thus leading to a decrease in the yield and quality of the plant. Predicting yield response for evaluating irrigation and fertilizer management strategies is of particular importance for making decisions. One of the decision support models in soybean is the CSM-CROPGRO-Soybean model, which is included in the DSSAT software package. The researches in the farm to determine the optimal solutions are done in agriculture and this item, in addition to the cost, is also time consuming, so the aim of this research is to use the DSSAT simulation model to evaluate the yield and water productivity in soybean plant under the conditions of water stress and nitrogen fertilizer were in Hormozgan province. Method: The current research was idone in the form of split plots in the form of a randomized complete block design in 3 replications, in Hormozgan province and in Haji Abad city in the years 2021 and 2022. The main factor includes no irrigation and supply of 40, 60, 80, 100 and 120% of water requirement and the sub-factor of nitrogen fertilizer amounts included consumption of zero, 50, 100, 150 and 200 kg/hectare. The data and information needed to implement the model include location, meteorological information, soil information and agricultural operations, and the estimation in the model was done using a combination of graphic and statistical methods. Comparison of values and distribution of simulated and measured data was presented with 1:1 graph and line. Results: The amounts of water use in the treatments of 40, 60, 80, 100 and 120 percent of water requirement in 1400 were 265, 354, 444, 533 and 623 mm, respectively and in 1401 were 259, 347, 435, 541 and 632 mm, respectively. The root mean square of the relative error (RMSEn) based on the years 1400 and 1401 showed that the yield of seeds, pods and biomass and the water productivity based on the yield of seeds, pods and biomass in the first year were 0.162, 0.161, 0.099, 0.304, 0.454 and 0.223%, and in the second year it was 0.195, 0.172, 0.106, 0.349, 0.485 and 0.247%, respectively. Wilmot agreement index (d) in the year 1400 for seed yield, pod and biomass respectively 0.902, 0.891 and 0.939% and for water productivity based on seed yield, pod and biomass respectively 0.828, 0.810 and 0.970 percent. In 1401 were for seed yield, pod and biomass 0.872, 0.885 and 0.936 percent respectively and for water productivity based on seed yield, pod and biomass respectively 0.889, 0.766 0 and 0.961 percent. The closeness of this index to the number one, it indicates the reliability of the simulated values. Conclusion: In general, based on the statistical results, the simulation of seed, pod and biomass yields under the effect of different irrigation requirements and different levels of nitrogen fertilizer was acceptable and it seems that the use of the model as a useful tool to support scientific research and improving decisions in water use management in soybeans in the study area are recommended. Manuscript profile -
Open Access Article
12 - Evaluation of efficiency of long-term weather data in trickle and sprinkler irrigation management
Samia Amiri Mahdi Gheysari Bita MovavejalahkamiProper estimation of crop water requirement is very important for water resource conservation in Iran. However, in most studies in Iran, the estimation of evapotranspiration is based on long-term weather data. However, use of simultaneous weather data of a non-agricultu MoreProper estimation of crop water requirement is very important for water resource conservation in Iran. However, in most studies in Iran, the estimation of evapotranspiration is based on long-term weather data. However, use of simultaneous weather data of a non-agricultural weather station may underestimate or overestimate the crop water requirement. Therefore, it is essential for irrigation specialist to be aware of the error of evapotranspiration calculated by long-term weather data. The objective of this study was to evaluate accuracy of evapotranspiration of reference crop using long-term weather data in comparison with simultaneous weather data in drip and sprinkler irrigation. The period was designated to be from 1995 to 2009 in Isfahan weather station, Kabootarabad weather station and Shahid Beheshti airport weather station. The maximum value of n-RMSE using long-term weather data in comparison to simultaneous weather data were 24% for trickle irrigation and 18% for sprinkler irrigation management, 22% in spring, 20% in summer, 44% in fall and 56% in winter. According to results of this study, the application of long-term weather data in deficit irrigation management is not recommended. On the other hand, due to sensitivity of trickle irrigation to water stress, the application of long-term weather data for estimating of evapotranspiration in irrigation scheduling is not recommended. Finally, application of automatic weather stations and simultaneous weather data for accurate irrigation management particularly in deficitirrigation management in critical situation of water shortage is recommended. Manuscript profile -
Open Access Article
13 - Estimation for potato products water requirement in Torbat Heidariyah region and determining the actual Evapotranspiration based on the reference Evapotranspiration
Gholamabas Fallahgh ghalhari Mohammad baaghideh Hasan RezaeiPotato is a tuberous product with important value in food supply for world and because of high efficiency per surface unit; it has higher energy and protein per surface unit than wheat and rice. In order to increase the plantation of potato prevention of water waste is MorePotato is a tuberous product with important value in food supply for world and because of high efficiency per surface unit; it has higher energy and protein per surface unit than wheat and rice. In order to increase the plantation of potato prevention of water waste is essential. One effective way to the purpose of this investigation is a well programmed irrigation protocol which is achievable an exact estimation of the need of the plants for Water requirement. The applicable equation to estimate Evapotranspiration does not use the same climate parameters and due to the practical entity of this process they are not applicable for all climate conditions. Thereby, there has to be a suitable equation to be used in each region. To reach this goal, in this study, by the aid of data collected from Torbat Heidariyah weather station, the amount of real Evapotranspiration has been calculated using correlation coefficient and compared with the reference Evapotranspiration (F-P-M).The results show that the amount of Evapotranspiration is 2/63 times more than the mean precipitation in growing season. It means that the plants have been using their moisture storage to accomplish their Evapotranspiration. In order to replenish the moist content in plants irrigation is essential. Using the Cropwat method, potato need for water supply was estimated 803/1mm from the beginning of implantation to the end of harvesting and the estimation of the amount of water to supply this need is equal to 741/9mm. Manuscript profile -
Open Access Article
14 - برآورد نیاز آبی محصولات کشاورزی در استان خوزستان
کاظم حمادی فاطمه ذاکرحسینی سید محسن حسین زاده ساداتی سروش اله دینیکی از گام های مؤثر در استفاده از منابع آب، برآورد صحیح مقدار آب مورد نیاز گیاهان می باشد، عدم برآورد صحیح این مقدار منجر به هدر رفت آب و عدم دستیابی به پتانسیل عملکرد مطلوب، کاهش پتانسیل تولید، تخریب منابع خاک با آبیاری زیاد و یا عدم آبشویی کافی و شور شدن خاک ها در اثر Moreیکی از گام های مؤثر در استفاده از منابع آب، برآورد صحیح مقدار آب مورد نیاز گیاهان می باشد، عدم برآورد صحیح این مقدار منجر به هدر رفت آب و عدم دستیابی به پتانسیل عملکرد مطلوب، کاهش پتانسیل تولید، تخریب منابع خاک با آبیاری زیاد و یا عدم آبشویی کافی و شور شدن خاک ها در اثر آبیاری کمتر از حد لزوم خواهد شد که این امر نهایتاً توسعه پایدار کشاورزی را به مخاطره خواهد انداخت. این مقاله با به کارگیری اطلاعات بیش از 40 ایستگاه، هواشناسی، تبخیرسنجی و سینوپتیک به محاسبه تبخیر و تعرق پتانسیل گیاه مرجع، بارندگی موثر، نیاز آبی گیاهان گندم، ذرت، نیشکر، هندوانه و گوجه پرداخته است و با اعمال راندمان های مختلف نیز نیاز آبی ناخالص محاسبه شد. از آن جایی که محاسبات به صورت نقطه ای و ایستگاهی انجام گرفته است؛ این یافته ها با استفاده از تکنیک های زمین آماری در محیط GIS در سطح استان خوزستان گسترش یافت. در نهایت نشان داده شد که بهبود مصرف در راندمان های پایین باعث کاهش نیاز آبی بیشتر نسبت به راندمان های بالاتر می شود و لذا مدیریت مصرف در گام های اولیه بازدهی بیش تری دارد. Manuscript profile -
Open Access Article
15 - محاسبه نیاز آب زیست محیطی حوضه کارون بزرگ و زیرحوضه آبریز کارون علیا
کاظم حمادی لیلا نوذریان هوشنگ حسونی زادهنیاز محیط زیست رودخانه، مقدار آبی است که برای حفظ شرایط طبیعی اکولوژیکی و سلامت کیفی آب رودخانه مورد نیاز می باشد. در این پژوهش برآورد نیاز آبی زیست محیطی رودخانه های کارون، دز، کارون بزرگ و زیر حوضه بهشت آباد (کارون علیا) با استفاده از روش هیدرولوژیکی مونتانا و روش هید Moreنیاز محیط زیست رودخانه، مقدار آبی است که برای حفظ شرایط طبیعی اکولوژیکی و سلامت کیفی آب رودخانه مورد نیاز می باشد. در این پژوهش برآورد نیاز آبی زیست محیطی رودخانه های کارون، دز، کارون بزرگ و زیر حوضه بهشت آباد (کارون علیا) با استفاده از روش هیدرولوژیکی مونتانا و روش هیدرولوژیکی پیشنهادی مبتنی بر تحلیل فراوانی جریان در حالت طبیعی و استفاده از چندک ها صورت گرفت. برآورد ها نشان می دهد که نیاز آبی زیست محیطی شاخه کارون حدود 4800، شاخه دز 3000 ، کارون بزرگ 8000 و زیر حوضه بهشت آباد حدود 800 میلیون مترمکعب در سال می باشدکه در این صورت آب مازاد برای انتقال از سد و تونل بهشت آباد به فلات مرکزی وجود نخواهد داشت و این زیرحوضه فقط توانایی تأمین مصارف درون خود، انتقال آب از طریق تونلهای کوهرنگ و نیاز زیست محیطی خود را دارا است. Manuscript profile -
Open Access Article
16 - The Effect of Cold and Drought Stresses on Yield, Yield Components and Water Use Efficiency of some Corn Hybrids (Zea mays L.)
Mohsen Tarighaleslami Mohammad Kafi Ahmad Nezami Reza zarghamiCold and drought stresses are considered as the most important factors limiting crop production. To evaluate the effect of these tow stresses on yield and yield components of corn hybrids, a field experiment was implemented in split plots based on a randomized complete MoreCold and drought stresses are considered as the most important factors limiting crop production. To evaluate the effect of these tow stresses on yield and yield components of corn hybrids, a field experiment was implemented in split plots based on a randomized complete block design in 3 replicates during 2014 at the Research Greenhouse of Ferdowsi University of Mashhad. In this research, chilling stress in two levels (i.e. non-stress, and cold stress) is considered as the main factor and three levels of drought stress (i.e. irrigation equivalent to 100% of plants water requirement, non-stress as control, irrigation equivalent to 75% of plants water requirement, and irrigation equivalent to 50% of plants water requirement) as sub factor and three hybrid corn (i.e. single-cross 704, single-cross 400, single-cross 260). The results showed that the effects of drought and hybrids on traits under study were significant. Cold and drought stresses interaction of different corn varieties on the traits under study (seed number per ear, 100-seed weight, yield, biological yield and harvest index) was also significant. The highest seed yields of hybrid 704 and hybrid 400 under 100% water requirement were 7887 and 6862 kg.ha-1 respectively. Single-cross 400 variety had the highest water productivity in line with the 704 variety with the highest grain yield and water consumption efficiency, water consumption efficiency for biomass production in water-limited conditions increased. Finally, it shows that cold and drought stress interaction resulted in highest water consumption efficiency in the treatments of non-chilling stress and 100% water requirement. Manuscript profile -
Open Access Article
17 - Estimation of wheat water requirement under climate change in Moghan plain (Parsabad)
Mahyar Ahadi Bromand Salahi shahram Kowsari MehrDetermining the water requirement of crops in the upcoming period and having an overview of it is essential in water resources management planning and using it we will be able to determine critical areas. The purpose of this research is to estimate the water requirement MoreDetermining the water requirement of crops in the upcoming period and having an overview of it is essential in water resources management planning and using it we will be able to determine critical areas. The purpose of this research is to estimate the water requirement of wheat using general circulation model data (HadGEM2-ES) by the latest Climate Change Report (Fifth Report) as Representative Concentration Pathway scenarios (RCP), which is scaled using LARSWG model under RCP85 scenario. To this end, 30-year data (1990–2019) were entered into the model, and climatic data were predicted daily for the next 40 years in two time periods (2021–2040) and (2041–2060).The results show that over the 40-year period, all three parameters of maximum, minimum temperature and precipitation will have an increasing trend.In the next step, the data generated to calculate the water requirement of wheat in Pars Abad plain were entered into CROPWAT 8.0 software and it was observed that increasing temperature leads to increase evapotranspiration and increasing water requirement of wheat by 3 to 5% under climate changing. Manuscript profile -
Open Access Article
18 - The assessment of quantitative and qualitative yield of different native and foreign sugar beet (Beta vulgaris L.) cultivars under optimal and limited irrigation conditions
heydar azizi Esmail Nabizadeh Azad Ebrahimi Rahim MohammadianThis study was conducted to evaluate 18 different native and foreign sugar beet cultivars in terms of some important quantitative and qualitative traits under optimal and limited irrigation conditions in 2017 crop season in as a strip split plot design (normal and stres MoreThis study was conducted to evaluate 18 different native and foreign sugar beet cultivars in terms of some important quantitative and qualitative traits under optimal and limited irrigation conditions in 2017 crop season in as a strip split plot design (normal and stress conditions) as main plots and cultivar factor as sub plots based on RCB design with six replications. The results of combined ANOVA of the obtained data showed that the interaction effect of the environment × cultivar was significant on sugar yield, white sugar yield, alkalinity coefficient, molasses sugar (p≤0.05), and root potassium content (p≤0.01) traits while it had no effect on other traits. Based on the obtained results from ANOVA, the effect of cultivar was not significant on α-amino nitrogen trait while it was significant on other assessed traits under normal condition. Also, under stress condition, the cultivar effect was significant at p≤0.01 on all of the assessed traits. In terms of root yield trait, Merak and Dorthea foreign cultivars had the highest value with 86.5 and 70.4 t ha-1 and Sharif native cultivar had the lowest value with 14.3 and 17.2 t ha-1 under normal and stress conditions, respectively. Under normal and stress conditions, the mean sugar contents were calculated 19.88 and 20.15%, respectively. Although the difference was not significant, the increase in sugar content (about 1.34%) under stress condition was as expected. Given that the decreasing and increasing effects of water deficit stress on most measured traits were not significant, it can be found that sugar beet crop has a good tolerance threshold for water deficit and, surely the finding should always be considered by beet farmers in West Azarbaijan province, especially in the current situation in which there are attempts to revive the drying Urmia lake. Manuscript profile -
Open Access Article
19 - Effect of substrate and humic acid on some morphophysiological traits and water consumption of Carpobrotus edulis L. in a green roof system
Maliheh Rabbani Kheir Khah Fatemeh KazemiThe health of plants in green roof conditions depends to a large extent on the supply of water required by plants. The composition of the substrate is effective in maintaining the moisture and making it available to the plant, and one of the solutions to reduce water co MoreThe health of plants in green roof conditions depends to a large extent on the supply of water required by plants. The composition of the substrate is effective in maintaining the moisture and making it available to the plant, and one of the solutions to reduce water consumption in the green roof is improving the substrate. In this study, water requirement and some morphophysiological traits of Carpobrotus edulis L. were studied under substrate and humic acid treatment. The research was conducted in green roof box conditions as a factorial experiment based on a randomized complete block design with three replications from May to September 2020 in Mashhad. The first factor was substrate including Substrate 1 (soil 20% + 20% Leica + 20% perlite + mineral pumice + 20% leaf soil), Substrate 2 (substrate 1 + 6% by weight of bentonite), Substrate 3 (substrate 1+ 12% by weight of bentonite), soilless Substrate 4 (27% mineral pumice + 27% Leica + 27% perlite + 20% leaf soil), Substrate 5 (substrate 4 + 6% by weight bentonite), and Substrate 6 (substrate 4+ 12% by weight of bentonite). The second factor was the concentration of humic acid (0, 100, and 200 mg L-1) applied as fertigation every 15 days. Soil-containing substrates performed significantly better than soilless substrates and the highest coverage, root length, and volume of green roof plants were observed in substrate 3 (containing soil and 12% by weight of bentonite). The highest leaf water and chlorophyll contents and the lowest relative saturation deficit, carotenoids, phenols, and leaf carbohydrates were observed in Substrate 3, which show the physiological stability of the plant under stress conditions, was evident in substrate 3. Application of 200 mg/L humic acid was associated with the best growth and physiological performance of plants. A substrate rich in moisture and nutrients, including 20% Soil + 20% Leica + 20% perlite +20% mineral pumice + 12% w bentonite + 200 mg/L humic acid resulted in the plants with optimal water consumption. The presence of soil and mineral superabsorbent (bentonite) in the green roof substrate is especially important in terms of moisture retention, and of course, the supplementary nutrition of plants in the green roof also improves their performance in the green roof. Manuscript profile -
Open Access Article
20 - Impact evaluation of the superabsorbent polymer on the yield and some growth factors of green pea plant under drought stress conditions
Babak Karimian Nemati Davoud Khodadadi Dehkordi Kamran MohsenifarIn this research, the effect of superabsorbent polymer on the yield and some of the growth factors of green pea plant under the drought stress was investigated. The experimental factors included: irrigation treatments at two levels of 100% water requirement (I1) and 70% MoreIn this research, the effect of superabsorbent polymer on the yield and some of the growth factors of green pea plant under the drought stress was investigated. The experimental factors included: irrigation treatments at two levels of 100% water requirement (I1) and 70% water requirement (I2) by the plant. The second factor included the levels of superabsorbent application which included three levels of control treatment (S0), potting soil with a weight percentage of 1 (S1) and potting soil with a weight percentage of 2 (S2). The third factor was the location of superabsorbent application which included its application at the upper 10 cm of potting soil (O), the area around the root length within the pot (M), and at the 10 cm lower end of the potting soil (U). According to the results, the largest amounts of root length, root dry weight, plant dry weight, grain dry weight and number of pods per plant were achieved when the irrigation water amount was equal to 70% of the plant water requirement (I2), the superabsorbent amount was equal to 1% of the potting soil (S1) and the superabsorbent was at the 10 cm lower end of the pod (U) and the largest amount of number of grains per pod occurred at I2S2U treatment and their differences were significant at 5% level compared to the control treatment. The presence of the superabsorbent at the surface and middle of the pot had not been much effective in providing water and nutrients for the plant. Manuscript profile -
Open Access Article
21 - The Effect of Soil Moisture and Climatic Index of Evapotranspiration on Forage Production in Rangelands of Dehsir, Yazd province, Iran
Elham Fakhimi Hossein Arzani -
Open Access Article
22 - Studying the effect of irrigation regimes and superabsorbent on proline and soluble sugars and their relationship with forage dry matter of sorghum
mansour fazeli rostampour mehrdad yarniya Gh. Mosavi M.J. SeghataleslamiStudying the effect of irrigation regimes and superabsorbent on proline and soluble sugars and their relationship with forage dry matter of sorghum Abstract In order to investigate the possibility of decreasing sorghum water requirements with application of SAP and to MoreStudying the effect of irrigation regimes and superabsorbent on proline and soluble sugars and their relationship with forage dry matter of sorghum Abstract In order to investigate the possibility of decreasing sorghum water requirements with application of SAP and to investigate the relationship between the accumulation of proline and soluble sugars with leaf relative water content (RWC) and forage yield in sorghum variety Speedfeed this experiment was conducted in Dashtak region of Zahedan during 2013 and 2014 seasons in a split plot with four irrigation regimes, providing 40, 60, 80 and 100% of the water requirements of sorghum, calculated from pan evaporation as main plots, four amounts of SAP )0, 75, 150 and 225 kg ha-1( as subplots based on a completely randomized block design with three replications. The results indicated that the effect of irrigation regimes, SAP levels and interaction effects of two factors in all measured traits were significant. The regression models estimated for two years showed that although applying SAP in 100% ETc treatment had no effect on this trait in 2 seasons but the other irrigation treatments reduced the accumulation of proline and soluble sugars and increased the RWC and dry matter. Therefore, applying 75 kg SAP per hectare along with 20% decrease in the sorghum’s water requirement produced a dry matter yield Similar to 100% water treatment. Manuscript profile -
Open Access Article
23 - Assessment Water Consumption and Planting Pattern on Edaphic Soil Properties and Grain Yields of Corn in Khouzestan Province
H. Dashti Sh. Lak غلامرضا عبادوزThis research was conducted as split plot experiment based on randomized complete block design in three replication at research farm of Islamic Azad university of Ahvaz branch to determine water requirement and optimum planting pattern of corn hybrid (S.C 704) in 2012. MoreThis research was conducted as split plot experiment based on randomized complete block design in three replication at research farm of Islamic Azad university of Ahvaz branch to determine water requirement and optimum planting pattern of corn hybrid (S.C 704) in 2012. Main plot was irrigation included three level (60%, 80%, 100%) and sub plot was included two planting pattern (cultivate in furrow and middle of stack). Effect of water requirement on all measured traits (soil salinity, soil moisture percent, sodium absorption rate, day to flowering, days to silk appearance 50%, number of rows per ear, number of grain per row, grain weight, grain yield, yield dry matter) expect harvest index were significant at 1% probability level. Interaction effect of water requirement and planting pattern on traits of soil salinity, soil moisture percent, sodium absorption rate, grain yield and dry matter yield were significant. Treatment of 100% water irrigation and planting at furrow had Maximum grain yield (1086.2 g.m-2) and yield dry matter (2060.5 g.m-2). Maximum soil salinity (6.183 ds.m-1) and sodium abortion rate (4.487) were achieved at treatment of 60% Irrigation and planting on middle of stack. Generally it can be recommended to planting furrow without drought stress and supply water requirement completely to achieve maximum corn yield in Khuzestan sour lip land. Manuscript profile -
Open Access Article
24 - Studying the dry matter yield and water use efficiency of forage sorghum under water deficit and applying superabsorbent polymer
mansour fazeli rostampourIn order to investigate the possibility of decreasing forage sorghum (Sorghum bicolor L. var speedfeed) water requirements applying of superabsorbent (SAP), without decreasing the dry matter yield and increasing the water use efficiency, and also to investigate the econ MoreIn order to investigate the possibility of decreasing forage sorghum (Sorghum bicolor L. var speedfeed) water requirements applying of superabsorbent (SAP), without decreasing the dry matter yield and increasing the water use efficiency, and also to investigate the economic efficiency of applying superabsorbent (SAP), this experiment was conducted in Dashtak region of Zahedan during 2013 and 2014 seasons in a split-split plot with four irrigation regimes, providing 40, 60, 80 and 100% of the water requirements of sorghum, calculated from pan evaporation as main plots, four amounts of SAP )0, 75, 150 and 225 kg ha-1( as subplots and cutting as sub-subplots based on a completely randomized block design with three replications. The results indicated that the effect of irrigation regimes, SAP levels and their interaction effects of the two factors on dry matter yield, water use efficiency, and economic efficiency were significant. The regression models estimated showed that applying SAP in 100% ETc treatment had no effect on this trait but in the other irrigation treatments caused an increased the dry matter yield and water use efficiency. Therefore, applying 75 kg SAP per hectare along with 20% decrease in the sorghum’s water requirement in arid regions, the dry matter yield and water use efficiency is maintained similar to 100% sorghum’s water requirement. Also the greatest economic efficiency of applying SAP was secured at 75 kg SAP per hectare SAP level and 80% of sorghum’s water requirement. Manuscript profile -
Open Access Article
25 - Long term trend analysis of changes in tomato (Lycopersicon esculentum) water use efficiency in the southern, southwest and central regions of Iran
Leila Jafari Farzin Abdollahi Sara AsadiIn order to improve water utilization management the trends of changes in crop water requirement (CWR), yield, cultivation area and water use efficiency (WUE) of tomato in some regions of Iran evaluated in a 23-year long term (1990-2013) by measuring evapotranspiration MoreIn order to improve water utilization management the trends of changes in crop water requirement (CWR), yield, cultivation area and water use efficiency (WUE) of tomato in some regions of Iran evaluated in a 23-year long term (1990-2013) by measuring evapotranspiration (ET) and crop coefficient (Kc). Highest (1137 mm) and lowest (642 mm) CWR of tomato observed in Yazd and Shahrekord cities respectively. Unlike Dezful and Shiraz, this characteristic has a significant increasing trend with a slope of 5.6 mm per year in Fasa. Furthermore, unlike Fasa, tomato yield in Ahvaz, Bandar Abbas, Shahrekord and Yazd has a significant increasing trend. The maximum (49.5 ton/ha) and minimum (19.4 ton/ha) tomato yield and also the maximum (5.6 Kg/m3) and minimum (2.4 Kg/m3) WUE was observed in Fasa and Kerman, respectively. However, the highest reduction (0.1 kg/m3) and highest increase (0.07 kg/m3) in WUE per year was obtained in Ahvaz and Fasa respectively. The results of this study showed that the WUE has a linear relationship with tomato yield. So that the water consumption per 100 kilograms of tomatoes yields per unit of area increased 0.1 kg/m3. While there was no logical relationship between WUE and CWR. By drawing the boundary-line, which represents potential yield against the CWR, high fluctuation of tomato yield in a steady interval of water requirement was estimated. Overall, the lack of a relationship between the WUE and CWR in the range of 600 to 1000 mm was due to yield gap caused by malpractice in the farms. Manuscript profile -
Open Access Article
26 - Estimation of the water requirement of several species of shrubs in the green space of Shiraz using the landscape plant factor
Majid Abasizadeh mohammad shokrollahzadehToday, the importance of water in maintaining life, especially in arid and semi-arid areas, is not hidden from anyone,.. There are various techniques to determine evaporation and transpiration, which include the use of empirical formulas, lysimeters, remote sensing and MoreToday, the importance of water in maintaining life, especially in arid and semi-arid areas, is not hidden from anyone,.. There are various techniques to determine evaporation and transpiration, which include the use of empirical formulas, lysimeters, remote sensing and satellite methods. It is micro-climatic technologies and methods of using plant transpiration coefficient. This research started in April 2014 and was completed by the middle of September 2014. Studies were conducted on three species of bay leaf (Laurus nobilis L.), rosemary (Rosmarinus officinalis L.) and oleander (Nerium oleander L.) located in the parks and boulevards of all 9 districts of Shiraz municipality. To calculate the rate of evaporation and transpiration of the target plant, first the rate of evaporation and transpiration of the reference plant was calculated using the data of the Shiraz synoptic station and the standard Penman-Mantis-FAO method, and then the coefficient (KL) was calculated based on the California method. This coefficient is the key factor in estimating the water requirement of green space. The highest rate of reference evaporation and transpiration is related to the months of August and July, respectively, and the lowest is related to the months of Bahman and January. . The highest water requirement is between June and October. In order to solve a large part of the lack of water resources mentioned, methods such as recycling and reuse of returned water, using non-conventional water sources (sewage, sewage, gray water, etc.) and surface water and runoff are suggested as solutions. Manuscript profile -
Open Access Article
27 - Irrigation Water Volume and Water Efficiency of Walnut Orchards in As-Suwayda, Syria
Hussam Abdullah Abbas Ammar Dham Hamza Radhi Zainab Hussein Adhub Majeed M. Abid Noora M. Hameed Hanan Askar Hussny -
Open Access Article
28 - The effect of mycorrhizal fungi, water stress and year on flower yield and some characteristics of medicinal plant of Borage (Borago officinalis L.) in Yasouj region
Ali RahimiIdentifying the critical time and timing of plant irrigation based on a precise and basic plan is the key to water conservation, improvement of irrigation operations and plant tolerance to water shortage in agriculture. In recent years, vesicular arbuscular mycorrhizal MoreIdentifying the critical time and timing of plant irrigation based on a precise and basic plan is the key to water conservation, improvement of irrigation operations and plant tolerance to water shortage in agriculture. In recent years, vesicular arbuscular mycorrhizal fungi have been used in many plants to deal with dehydration and drought stress. In this regard, an experiment was conducted as split-plot in the form of randomized complete block design with 3 replications in the Yasuj region at years 2015 and 2016. Water stress was considered as the main factor in the form of irrigation after 30, 60, 90, 120 and 150 mm of evaporation from the evaporation pan class A and mycorrhizal fungus was considered as a secondary factor in the form of no application, application of Glomus mosseae and application of Glomus intraradices. The results showed that the interaction of irrigation and mycorrhizal fungi on flower phosphorus, flower yield, biological yield and water use efficiency of Borage was significant. In irrigation levels after 60, 90, 120 and 150 mm of water evaporation from the evaporation pan, the use of mycorrhizal fungi Glomus mosseae and Glomus intraradices compared to the absence of fungi respectively increased the yield of plant flowers (30.04% and 27.35 %), (90.2% and 90.98%), (93.21% and 94.1%) and (81.73% and 78.86%), also, at these levels of irrigation, biological yield and water use efficiency of Borage flower achieved a significant increase in the presence of mycorrhizal fungus, compared to the absence of mycorrhizal fungus application. Application of both strains of mycorrhizal fungus Glomus mosseae and Glomus intraradices in irrigation levels after 90, 120 and 150 mm of water evaporation from the evaporation pan compared to no application of mycorrhizal fungus, respectively, resulted in a significant increase in the harvest index of Borage flower (44.55% and 43.36%), (13.21% and 15.96%) and (5.6% and 5.41%) and flower phosphorus (44.69% and 20.45%), (150% and 125%) and ( 267.74% and 235.48%). Mycorrhizal fungus was able to moderate the negative effects of drought stress and increase the above-mentioned traits in those irrigation levels, and based on the results of this study, irrigation treatment after 90 mm of water evaporation from the evaporation pan + the use of Glomus mosseae mycorrhizal fungi is recommended. Manuscript profile -
Open Access Article
29 - The Effect of Irrigation Regims and Humic Acid Levels on Quantitative and Qualitative Characteristics of Peanut (Arachis hypogaea L.)
Saeed Mahdavi Naser Mohammadian Roshan Majid Ashouri Ebrahim Amiri hamidreza doroudianIn order to investigate the effect of irrigation regimes and amounts of humic acid on the quantitative and qualitative characteristics of peanuts, an experiment was conducted a split in a randomized complete block design. It was performed with three replications in the MoreIn order to investigate the effect of irrigation regimes and amounts of humic acid on the quantitative and qualitative characteristics of peanuts, an experiment was conducted a split in a randomized complete block design. It was performed with three replications in the cropping years of 2018 and 2019 in Astana-Ashrafieh city of Guilan province. Experimental treatments included irrigation regime (rainfed and water requirement of 60, 80 and 100%) as the first factor and humic acid (without fertilizer, 3, 6 and 9 L.ha-1) as the second (secondary) factor. The results showed that the interaction of irrigation and humic acid on biological yield and pod and grain yield was significant. The highest grain yield was obtained in the irrigation treatment of 100 and 80% of water requirement and with the use of humic acid 9 L.ha-1 with an average of 2562 and 2526 kg.ha-1, respectively. Biological yield under 80 and 100% water requirement was 6714 and 6772 kg.ha-1, respectively. The highest biological yield was observed in different amounts of humic acid in treatments of 9 L.ha-1 at the amount of 7436 kg.ha-1. Pod yield in the treatment of 80 and 100% of water requirement were 2427 and 2435 kg.ha-1, respectively. The lowest and highest pod yields in different amounts of humic acid were in the treatments without fertilizer and 9 L.ha-1 with an average of 1453 and 2706 kg.ha-1, respectively. Treatment of 80% of plant water requirement and the amount of humic acid consumed at 9 L.ha-1 with an average of 745.5 kg.ha-1, had the highest rate compared to other treatments. According to the research results, the use of humic acid 9 L.ha-1 can be suggested by providing 80% of water requirement as suitable conditions for the study area. Manuscript profile
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