List of Articles Water stress

• Open Access Article
  • Abstract Page
  • Full-Text
  
  1 - The effect of drought stress and different amounts of nitrogen and potassium fertilizers on productivity of forage sorghum variety speedfeed
  fatmeh khezerloo
  To investigation the effects of water stress and different rates of nitrogen and potassium fertilizer on yield of forage sorghum variety speedfeed (Sorghum bicolor L. Moench) in second cropping , a field study was conducted at 2009 cropping season in KhoyResearch Sta More

  To investigation the effects of water stress and different rates of nitrogen and potassium fertilizer on yield of forage sorghum variety speedfeed (Sorghum bicolor L. Moench) in second cropping , a field study was conducted at 2009 cropping season in KhoyResearch Station. Experiment was carried out using a split plot design , used on RCBD with 3 replications. Treatments consisted three level of water stress (I1=70 , I2=105 , I3=140 )mm evaporation from the pan of class A, as main factors and sub factors consisting nitrogen consumption in three levels (N1=300),(N2=400),(N3=500) kg/ha as source, urea and potassium in three levels (K1=0),(K2=150),(K3=300)kg/ha as source K2So4, of course foliar application urea in amount 33 kg/ha in stage doughying grain in single treatment and phosphorous consumption based on fertilizer recommendation in amount (P=50)kg/ha as source Tsp in total treatment was carried out. Investigated characteristics were , plant height , stem diameter, leaf number, tiller number per plant, leaf to stem ratio , fresh fodder and biologic yield ear yield, relative water content (RWC) and chlorophyll content. The results analysis of variances showed that plant height, fresh fodder and biologic yield, chlorophyll content, relative water content (RWC) impressed after of stage leaf 4-5 by water stress , but significant difference was not observed in other traits. Applying amounts of fertilizers reduced significantly plant height, stem diameter, tiller number, fresh fodder and biologic yield, ear dry weight, chlorophyll content. So that applying 500 kg/ha urea and 300 kg/ha K2SO4 and 50 kg/ha TSP reduced increase yield. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  2 - The Effects of Different Irrigation Regimes and N Fertilizer on Yield, Yield Components and the Content of Micronutrients in Brown and White Rice (cv. Hashemi and Gilaneh)
  Sajad Eisapour Nakhjiri Majid Ashouri Seyyed Mostafa Sadeghi Naser Mohammadian Roushan Mojtaba Rezaei
  10.30495/jcep.2021.683382
  Due to the limit of water availability in rice fields, alternate wetting and drying irrigation are used instead of continuous submergence to reduce water consumption in rice fields. Therefore, this study was conducted to evaluate the effects of different irrigation regi More

  Due to the limit of water availability in rice fields, alternate wetting and drying irrigation are used instead of continuous submergence to reduce water consumption in rice fields. Therefore, this study was conducted to evaluate the effects of different irrigation regimes and N fertilizer rates on yield, and the content of micronutrients in brown and white rice at Rashat during cropping seasons of 2016-2017 and 2017-2018. Experiment was arranged in split plot based on complete randomized block design with 3 replications in which water regimes continuous submergence (I1), 7 (I2) and 15 (I3) day interval irrigation were asseigned as main factor and nitrogen fertilizer levels (50 (N1), 75 (N2), and 100 (N3) kg.ha-1) as sub factor, and cultivars, Gilanh (C1) and Hashemi (C2) as sub sub factor. Results showed that the effect of year on yield and number of panicle per m2 was significant. The interaction of different irrigation treatments and N fertilizer and cultivar on the number of panicle per m2 in 2017, yield in 2017 and 2018, and micronutrient content were significant. Increasing the irrigation intervals decreased number of panicle per m2, number of seed per panicle, weight of 1000 grain, and yield, while the consumption of 75 and 100 kg.ha-1 of nitrogen fertilizer increased these traits in all three irrigation treatments compared to the level of 50 kg.ha-1 of nitrogen fertilizer. Gilaneh in all irrigation treatments showed higher yield, number of panicle per m2, and number of seed in panicle. Also, increasing of the irrigation intervals increased the content of micronutrients in brown and white rice seeds. The consumption of 75 and 100 kg.ha-1 of nitrogen fertilizer increased these traits as compared to the other levels of nitrogen fertilizers. The highest content of Zn, Cu, Fe, and Mn was observed in brown and white rice at irrigation interval at 14 days and 100 kg.ha-1 nitrogen fertilizer application. The consumption of 100 kg.ha-1 of nitrogen fertilizer increased the quantitative and qualitative grain yield of both cultivars as compared to the other two levels of nitrogen fertilizer and to irrigation regimes. Proper level of fertilizer would compensate the adverse effects of increasing irrigation intervals. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  3 - Investigating the effect of biochar obtained from Azolla filiculoides on the morphophysiological characteristics of Kochia prostrata L. under drought stress
  Fateme Heydari Ghasem Ali Dianati Tilaki Yahya Kooch Mahdi Abdollahi
  10.30495/iper.2022.1964411.1813
  Water stress is one of the most important abiotic stresses that harms the growth of plants in arid and semi-arid regions. Plant traits reflect their response and adaptation to environmental changes, which play an essential role in predicting various environmental effect More

  Water stress is one of the most important abiotic stresses that harms the growth of plants in arid and semi-arid regions. Plant traits reflect their response and adaptation to environmental changes, which play an essential role in predicting various environmental effects on plants and plant processes. In order to investigate the effect of biochar on the morpho-physiological characteristics of the species (Kochia prostrata L.) in water shortage conditions, a factorial experiment was conducted in the form of a completely randomized design with three replications in greenhouse condition. Drought stress treatments included four levels (25, 50, 75, and 100% of the field capacity), and biochar treatment included four levels (control, 5 g, 15 g, and 30 g). Morphological traits (plant height, root length, aerial biomass weight, and root biomass weight) and physiological traits (photosynthesis, plant water potential, stomatal conductance, and transpiration) of the target species were assayed under drought and biochar treatments. Results showed that the interaction effect of drought stress and biochar on all characteristics except for plant height was significant. Moreover, the main effect of drought stress on all characteristics except for photosynthesis and water potential and also the main effect of biochar on all characteristics except for root length) were significant. The treatment with 30 grams of biochar caused an increase in morphological characteristics (root length, plant height, and plant biomass) by 22%, 36%, and 50%, respectively, compared to the control; this treatment also caused a significant increase in photosynthesis and stomatal conductance by 107% and 32%, respectively compared to control. According to the findings, the biochar treatment of 15 grams resulted in a better performance and can be suitable to increase the efficiency in the species under study. The results obtained from this research can be an essential step toward the practical use of biochar in restoration and improvement of rangelands. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  4 - Study of content alterations of peroxidase, ascorbate peroxidase and catalase activity in two soybean cultivars (Glycine max L. merr) under water stress
  حسن Modareszadeh مه‌لقا Ghorbanli محمدعلی Rezaei
  Different cultivars of one species activate various enzymes such as superoxide dismutase, catalase, peroxidase, glutathione reductase and ascorbate peroxidase in order to defense against the water stress.These enzymes have important role in plant defense against the rea More

  Different cultivars of one species activate various enzymes such as superoxide dismutase, catalase, peroxidase, glutathione reductase and ascorbate peroxidase in order to defense against the water stress.These enzymes have important role in plant defense against the reactive oxygene species. In this study, behavior different of peroxidase, ascorbate peroxidase and catalase and effects of water stress on activity of them against drought and flooding were investigated in two soybean cultivars (Glycine max L. cv. Pershing and cv. DPX). An experiment was carried out under potting conditions and 4 treatments (20, 40, 60 and 80% of water saturation capacity) were used. Antioxidant enzymes indicated differences with stress and organ. Peroxidase activity increased in nodule and root under drought and flooding stress but in leaf, peroxidase activity increased in lower water contents (20 and 40%) and in DPX, significant difference did not shown in the all. In both studied organs, catalase activity increased in flooding and drought, in DPX and Pershing, repectively but significant difference did not shown in other treatment. In the leaf, ascorbate peroxidase activity decreased with decreasing in irrigation but in root, its activity indicated significant increaseing in flooding and drought, in DPX and Pershing, repectively. Results indicated that enzymetic activity can vary by cultivar, stress and organ type, too. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  5 - The Effect Of Deficit Irrigation Using Drought Tolerance Indices in Bean Phaseolus vulgaris L))
  Ali Rahemi Karizaki H. Davodi علی نخ‎زری مقدم ابراهیم غلامعلی پور علمداری
  In order to evaluate of some bean cultivars to drought stress, as well as identification the favorable tolerance indices to drought stress, two separates experiments into completely randomized design with 3 replications was conducted in green house at faculty of agricul More

  In order to evaluate of some bean cultivars to drought stress, as well as identification the favorable tolerance indices to drought stress, two separates experiments into completely randomized design with 3 replications was conducted in green house at faculty of agriculture, Gonbad Kavoos University, in 2013. The first experiment included study of moderate water stress after podding (30% water depletion of filed capacity) and the second experiments included study of severe water stress after podding (70% water depletion of field capacity) on different bean cultivars included With bean ( Daran), Red bean (c.v. Azadshahr), Green bean ( Sanray), and Pinto bean ( Saman). The results of present study showed that cultivars had significant differences on all studied indices except for ToL, SSI and STI in full irrigation and slight water stress. It was also observed that there was significant and positive regression between seed yield and indices like MP, GMP and HARM in full irrigation and slight water stress condition in 1% confidence level. Therefore, these indices could be most favorable indices to select tolerance cultivars under slight water stress. the highest amount of some indices namely MP, GMP and HARM was found in Pinto bean. In intensive stress condition, the cultivars had significant differences on TOL, MP and GMP indices in 5 % confidence levelTherefore, the most favorable index to select tolerance cultivar was identified in intensive drought stress. On the basis of GMP index, red and pinto beans were confirmed as preference cultivars in intensive stress. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  6 - Leaf Temperature as an Index to Determine the Irrigation Interval
  ABDOLREZA EGHTEDARI NAEENI ELHAM MOHRI ESFAHANI MOHSEN BEIGI HARCHEGANI MEHRDAD JAFARPOUR MARYAM GOLABADI
  Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  7 - 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 Rahimi
  Identifying 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 More

  Identifying 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