عملکرد محصول

Open Access Article

1 - Study of salinity distribution in cultivated soil profile under drip irrigation
leila mirzaeialamuti Bijan Nazari Abbas Sotoodehnia Hadi Ramezani Etedali

Conservation of soil and water resources in arid and semi-arid countries is a serious concern for salinity. The present study was carried out in a completely randomized block design to investigate soil salt accumulation in tape irrigation. Treatments included: “su More

Conservation of soil and water resources in arid and semi-arid countries is a serious concern for salinity. The present study was carried out in a completely randomized block design to investigate soil salt accumulation in tape irrigation. Treatments included: “surface plaque tape”, “semi-subsurface plaque tape in 10 cm depth of soil”, “surface tape”, “semi-subsurface tape in 10 cm depth of soil” and “surface tape with mulch”. Salinity of irrigation water was 2 dS/m with Forage Maize cultivation. The results of salinity analysis indicate that salt distribution in 15-20 cm depth soil and in 10-15 cm space from dripper had highest value. Also in confidence level of 95 %, in all of treatment in 0, 15 and 30 cm space of dripper and 0-20 cm depth of soil level there were different in salt but in another depth (20-40 and 40-60 cm) there weren’t any different also, in use of drip tape irrigation system in soil texture silt-loam discrete kind of tape and location of installation, mainly salt distribution happen between 0-15 cm space of dripper and 0-20 cm depth of soil level and we have to do leaching. In this research, surface tape with mulch treatment had the highest yield and lowest water use between studied treatments. This treatment reduced the amount of salt accumulation by 10.39% on average compared to other treatments. Manuscript profile

Open Access Article

2 - Investigating the impacts of latitude on virtual water content of major crops in the eastern provinces of Iran
Ali Arefinia Khaled Ahmadaali

Temperature 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 More

Temperature 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

3 - Effect of Tillage Direction and Straw Mulch on Precipitation Use Efficiency in Wheat Rainfed Land in a Semi-Arid Region
Alireza Vaezi Samira Rezaeipour Mohammad Babaakbari Fereshteh Azarifam

Background and aim: Soil properties and management methods can affect plant growth and crop yield in agricultural areas. Rainfed agriculture is a dominant farming type in the world, which covers about 80% of the world's cultivated land and about 67 % of agricultural lan More

Background and aim: Soil properties and management methods can affect plant growth and crop yield in agricultural areas. Rainfed agriculture is a dominant farming type in the world, which covers about 80% of the world's cultivated land and about 67 % of agricultural lands in Iran. Most of rainfed lands are in slope areas and tilled along slope, an incorrect method which accelerates water erosion. Controlling soil erosion and storing precipitation water in soil is the first step to conserve soil and water resources and increasing crop yield in rainfed lands. The change of tillage direction from along slope to contour line and maintaining crop residues can affect water loss, Precipitation use efficiency (PUE) and crop yield in rainfed areas. This study was carried out to investigate the effect of tillage direction and wheat straw mulch on water loss, crop yield and precipitation used efficiency in a winter wheat rainfed land. Methods: The study was carried out in a rainfed lands with sandy loam soil under a slope of 10% in west of Zanjan, North West of Iran. field experiments were conducted at two tillage direction: along slope and contour line, and five wheat straw mulch application levels (control, 25, 50, 75 and 100%) with three replications. Precipitation data (height, duration and intensity) was taken from the Agricultural Meteorological Station located in the University of Zanjan, about 800 m from the study field. Winter wheat was cultivated at the plots early autumn and harvested early summer. Water loss from the plots was measured for each rainfall event resulting runoff at the plots during nine months growth period. Wheat grain yield was determined for each plot and accordingly precipitation use efficiency (PUE) in kg/ha.mm was computed based on wheat grain yield (kg/ha) per effective precipitation during growth period (mm). Soil properties and winter straw mulch characteristics were determined using the conventional methods in the lab and the variance analysis was used for determination of independent effect of tillage direction and straw mulch level and interactions between the two factors. Results: Eighty-two precipitation events were occurred in the area during a 9 months winter wheat growth period, which rainfalls included 88% from it. Most of rainfalls occurred in October that resulted most water loss at the plots. Water loss at the plots tilled contour line was 14% lower than the plots tilled along slope. However, water loss between the two tillage directions was no significant, whereas wheat grain yield as well as PUE were significantly affected by tillage direction. Straw mulch considerably affected on water loss, wheat grain yield and PUE. An obvious decrease was found in water loss with increasing in straw mulch level. The lowest water loss among different mulch levels was in 100% mulch level for the two tillage directions (63% for along slope tillage and 64% for contour line tillage). Significant interaction of the two factors was observed just for wheat grain yield. The highest wheat grain yield was in 75% mulch level which was about 27% (2.04 ton/ha) and 34% (2.45 ton/ha) bigger than control treatment, respectively. The highest PUE was also in 75% mulch level both in along slope tillage (7.2 kg/ha.mm) and contour line tillage (8.6 kg/ha.mm), which was 27% and 34% higher than control treatment, respectively. Conclusion: Results show the precipitation use efficiency (PUE) is an improper index for evaluation of the role of precipitation in crop production in wheat rainfed lands. This index can be affected by both tillage direction and wheat straw mulch application in rainfed lands. These two management methods are independent factors which affects strongly on the wheat grain yield and in consequence on the PUE. The change of tillage direction from along slope to contour line along and application of 75% mulch level (equal to 4.5 ton/ha) are proper strategies for conservation of soil and water and improving the utilization of precipitation in wheat rainfed lands. Manuscript profile

Open Access Article

4 - رابطه متغیرهای اقلیمی با عملکرد و طول دوره‌ی مراحل رشد ذرت و گندم آبی در حسن‌آباد داراب، استان فارس
حدیث صادقی قاسم عزیزی سعید بازگیر

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5 - تأثیر زهکشی کنترل شده روی محصول نیشکر (مطالعه موردی اراضی کشت و صنعت نیشکر امام خمینی (ره))
رحیم عنافچه یدالله یوسفی فرد عبدعلی ناصری حیدرعلی کشکولی

حفظ تراز سطح ایستا بی در نزدیکی منطقه ریشه گیاه به منظور استفاده بهینه از آب آبیاری و تأمین رطوبت در منطقه ریشه، روش متداولی است که بیش از چند دهه مورد استفاده محققان قرارگرفته شده است. در این تحقیق امکان استفاده از روش زهکشی کنترل شده در شرایط آب و هوایی مرکز و جنوب اس More

حفظ تراز سطح ایستا بی در نزدیکی منطقه ریشه گیاه به منظور استفاده بهینه از آب آبیاری و تأمین رطوبت در منطقه ریشه، روش متداولی است که بیش از چند دهه مورد استفاده محققان قرارگرفته شده است. در این تحقیق امکان استفاده از روش زهکشی کنترل شده در شرایط آب و هوایی مرکز و جنوب استان خوزستان در دو تیمار آزاد (FD) و کنترل شده (CD) بر روی گیاه نیشکر مورد بررسی قرار گرفت. نتایج این تحقیق نشان داد که شوری خاک تیمار آزاد در لایه (30-0) سانتی متر به اندازه 3/1 دسی زیمنس بر متر نسبت به لایه مشابه در تیمار کنترل شده افزایش شوری داشته. تغییرات شوری در دیگر لایه‌ها برای دو تیمار ناچیز بود. از نظر آب مصرفی، تیمار کنترل شده 38 درصد آب کمتری نسبت به تیمار آزاد مصرف نموده وکارآیی مصرف آب آبیاری در تیمار کنترل شده 3/41 درصد بیشتر از تیمار آزاد بود. از نظر تعداد دور آبیاری، تیمار کنترل شده 33 درصد نسبت به تیمار آزاد کمتر بود و از نظر مقدار نمک ورودی، تیمار کنترل شده معادل 36 درصد نسبت به تیمار آزاد کمتر است. از نظر مقدار نمک خروجی از زهکش‌ها، تیمار کنترل شده به میزان 53 درصد کمتر از تیمار آزاد گردید. عملکرد کمی محصول (تن در هکتار) تیمار کنترل شده به میزان 66/8 درصد از تیمار آزاد بیشتر بوده است و در عملکرد کیفی محصول تیمار کنترل شده در نسبت وزن شربت به وزن نی (EX) 9/15 درصد، در میزان قند موجود در شربت (POL) 01/6 درصد، در میزان مواد جامد محلول در شربت (Brix) 24/5 درصد، در درجه خلوص شربت یا میزان قند خالص 8/0 درصد از تیمار آزاد بیشتر شده است. Manuscript profile

Open Access Article

6 - ارزیابی کارایی مدلSALTMED در برآورد عملکرد محصول ذرت علوفه‎ای در شرایط رایج آبیاری در دشت‌های شهرکرد و خان‎میرزا
حامد ریاحی فارسانی روح اله فتاحی نافچی

امروزه حفظ منابع آب و خاک، بسیار مورد توجه مجامع مختلف بینالمللی قرار گرفته است و مدلها می&lrm;توانند ابزارهای بسیار مفیدی برای مدیریت آب کشاورزی باشند. همچنین میتوانند در برنامهریزی آبیاری و محاسبه نیاز آبی گیاه و همچنین در پیشبینی محصول به ما More

امروزه حفظ منابع آب و خاک، بسیار مورد توجه مجامع مختلف بینالمللی قرار گرفته است و مدلها می&lrm;توانند ابزارهای بسیار مفیدی برای مدیریت آب کشاورزی باشند. همچنین میتوانند در برنامهریزی آبیاری و محاسبه نیاز آبی گیاه و همچنین در پیشبینی محصول به ما کمک کنند. در این پژوهش مدل SALTMED با استفاده از دادههای مزارع ذرت در دشتهای خان&lrm;میرزا و شهرکرد برای شبیه&lrm;سازی مقدار عملکرد محصول مورد ارزیابی قرار گرفت. نتایج حاصل از تجزیه و تحلیل دادههای مشاهدهای و شبیهسازی نشان داد تفاوت معنی&lrm;داری بین این دو مقدار وجود ندارد. همچنین مقدار جذر میانگین مربعات خطا (RMSE) 84/9، ضریب جرم مانده (CRM) 127/0- و ضریب کارآیی مدل (EF) 329/0-  بهدست آمدند. تمام نتایج این تحقیق نشان می&lrm;دهد که مدل SALTMED به طور موفقیت&lrm;آمیزی می&lrm;تواند ابزاری مناسب  برای مدیریت آبیاری و  پیشبینی عملکرد محصول در مزارع تحت آبیاری استان چهارمحال و بختیاری باشد. Manuscript profile

Open Access Article

7 - Identification of Cold Tolerant Rapeseed (Brassica napus L.) Cultivars Using Stress Tolerance Indices under Humic Acid Application
Shirin Alizadeh Arash Roozbahani Amir Hosein Shirani Rad Mohamadreza Haj Seyedhadi

10.30495/JCEP.2023.1923621.1773

In order to identify cold tolerant cultivars of rapeseed (Brassica napus L.) using stress tolerance indices under the influence of humic acid application, an experiment was conducted as factorial split plot based on randomized complete block design with three replicatio More

In order to identify cold tolerant cultivars of rapeseed (Brassica napus L.) using stress tolerance indices under the influence of humic acid application, an experiment was conducted as factorial split plot based on randomized complete block design with three replications in 2017 and 2018 at Seed and Plant Improvement Research Institute, Karaj, Iran. Factorial combination of cold stress as planting date factor in two levels including 20 October and 20 November, and humic acid factor in two levels including non-application (foliar spraying with pure water) and application (foliar spraying with a concentration of 1.5 per mil at 4-6-leaf stage) were assigned to the main plots and the cultivars were allocated to the sup-plots. The results showed that rapeseed cultivars differed significantly. Based on the results of means comparison, the cultivar WRL-95-07 showed higher yield in both stress and non-stress environments as well as the application and non-application of humic acid than the other cultivars. The correlation of drought tolerance indices with grain yield under stress and non-stress conditions was used to determine the most suitable indices. Arithmetic mean productivity (MP), geometric mean productivity (GMP), harmonic mean (HARM) and stress tolerance index (STI) had the highest significant correlation with yield under normal and stress conditions. Principal component analysis differentiated indices introducing tolerant cultivars and indices introducing susceptible cultivars, and on this basis, the 10 rapeseed cultivars were divided into three groups using cluster analysis. Finally, WRL-95-07 cultivar performed well under stress and non-stress conditions with the use of humic acid, followed by WRL-95-12 cultivar which displayed better performance than the other cultivars under stress conditions when treated with humic acid. Manuscript profile

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8 - Designing A Model to Investigate the Relationship among Organizational Capabilities, Competitive Advantage and New Product Performance: The Case of Food Corporations in Mashhad
Ebrahim Roushan Ghias Reza Sepahvand Abdolkhalegh Chenarestan Oulia ali pirzad

10.30495/qjopm.2021.569361.2114

All thriving organizations constantly strive to raise their performance standards. What may enhance any company’s competitive advantage is a set of capabilities including marketing, innovation and research and development capabilities. The present inquiry was an a More

All thriving organizations constantly strive to raise their performance standards. What may enhance any company’s competitive advantage is a set of capabilities including marketing, innovation and research and development capabilities. The present inquiry was an attempt to design a model to scrutinize the extent to which organizational capabilities, competitive advantage and new product performance may correlate. To this end, a questionnaire was distributed among 105 managers of food companies in Mashhad, Iran, and the collected data were analyzed via AMOS and SPSS softwares. The research findings indicated a significant relationship between organizational capabilities, including marketing capability, innovation capability, research and development capability, and competitive advantage components of product and product delivery speed. A significant relationship was also found between competitive advantage indicators like financial and consumer-oriented performances and components of product performance.     Manuscript profile

Open Access Article

9 - The effect of startup accelerators on product performance With the role of creative leadership moderator
Arash Haji Karimi حسین شکیبی

The purpose of this study is to investigate the impact of startup accelerators on their performance with a moderating role of creative leadership. Without use of creative processes and innovation, the new product is doomed to destruction. Managers drive innovation by li More

The purpose of this study is to investigate the impact of startup accelerators on their performance with a moderating role of creative leadership. Without use of creative processes and innovation, the new product is doomed to destruction. Managers drive innovation by linking community needs to new product development opportunities. This study, considering 112 knowledge-based companies in Iran, explored the importance of engaging the creative process in new product performance. Data were analyzed using the questionnaire using pls software. The results indicate that all factors affect the speed of new product development. The factors accelerating the pace of new product development are improving the performance of new product development. Increasing the speed of new product development, reducing the production cycle time by maintaining good quality and high reliability. The speed of new product development reflects the power of adaptation to the changing environment of the company. Creative leadership has a positive moderating role in the relationship between components of the creative process interaction on new product development performance. Managers and leaders support new ideas from the idea start-up stage to the commercialization stage, ensuring success in the creative process and better performance of the new product development. Manuscript profile

Open Access Article

10 - Effect of time management in rapeseed planting on yield based on expert point of view of Qazvin Agricultural Jahad Organization
Iraj Hoseini Mehdi Mirdamadi Shaghayegh Kheiri Saied Seifzade

       This study was done as survey type and data were collected by questionnaire. Validity of present study was checked by Chronobach’s Alpha method with 0.86 coefficient which was indicated its constancy. Statistical population wer More

       This study was done as survey type and data were collected by questionnaire. Validity of present study was checked by Chronobach’s Alpha method with 0.86 coefficient which was indicated its constancy. Statistical population were consist of 72 experts of agronomy department of Qazvin Agricultural Jahad Organization. SPSS software was employed to analysis collected data.  Results indicated that there was not a significant relationship between time management about rapeseed yield and age, experience, employment condition, educational level of experts. There was a significant relationship between time management about rapeseed yield and training and promotion factors, economic and technical aspects, land preparation, planting and harvesting dates. T-test, also, indicated that there was a significant difference between time management and the variable of expert’s educational courses. Multiple regression analysis showed that the four variables of planting, harvesting, land preparation and breeding operation predicted 42% of rapeseed yield efficiency.   Manuscript profile

Open Access Article

11 - Regional modeling of wheat yield production using the distributed agro-hydrological SWAP: (case study: Doroudzan irrigation and drainage network)
Elnaz Noroozi Hosein Babazadeh Majid Vazifehdoost Fereidoon Kaveh

Many decisions and policies in water management are made in a spatial scale larger than farm scale. In this study, the distributed SWAP model was evaluated to simulate wheat yield production in the Doroudzan irrigation and drainage network (Fars province, Iran) in wet, More

Many decisions and policies in water management are made in a spatial scale larger than farm scale. In this study, the distributed SWAP model was evaluated to simulate wheat yield production in the Doroudzan irrigation and drainage network (Fars province, Iran) in wet, normal and dry years. The study area was divided into 86 simulation units and yield production was determined in each spatial unit with the distributed SWAP. MATLAB program was used for regionalizing the SWAP model and making relationship between this model and input data in each simulation unit. The goodness-of-fit measures, such as correlation coefficient and maximum error were calculated as 88% and 0.94 ton/ha, respectively. In addition, the determined mean square error was less than standard deviation and the modeling efficiency was estimated satisfactorily. In this research, yield production in the simulation period was evaluated higher than the observed values. In farms located at the end of the network, the error percentage of the simulated performance was higher than other spatial units due to water deficit and soil salinity. In general, since there was a good consistency between simulated and observed crop production in Doroudzan network, distributed SWAP model can be used with a good accuracy to simulate and predict yield production and to manage irrigation network. Manuscript profile

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