Mohammad Yazdandoost Hamedani; Mokhtar Ghobadi; Mohammad Eghbal ghobadi; Saeid Jalali Honarmand; mohsen saeidi
Abstract
In order to evaluate the effect of foliar application of some chemicals on antioxidant enzymes activity and chlorophyll fluorescence of sunflower in different irrigation conditions as well as identifying compounds’ effectiveness in reducing the adverse effects of drought stress, this experiment ...
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In order to evaluate the effect of foliar application of some chemicals on antioxidant enzymes activity and chlorophyll fluorescence of sunflower in different irrigation conditions as well as identifying compounds’ effectiveness in reducing the adverse effects of drought stress, this experiment has been conducted at the Agricultural Research Center of Hamedan, Iran, between 2015 and 2016. Three irrigation and six foliar application treatments are evaluated in a split plot experiment based on randomized complete block design with three replications. Irrigation treatments consist of 60%, 80%, and 100% plant water requirement and foliar application treatments include abscisic acid 40 μM, Selenium 20 mg/L, Salicylic acid 500 μM, SNP 100 μM, Glycine betaine 100 mM, and the control. Results show that by decreasing the irrigation water, the activity of superoxide dismutase, peroxidase, and catalase enzymes rise sharply, while the maximum photochemical efficiency of photosystem II and grain yield decline. The interaction effect of irrigation × foliar application on the activity of antioxidant enzymes and grain yield is significant, but not so on chlorophyll fluorescence. In deficit irrigation treatments, foliar application of all chemical compounds significantly boost the activity of antioxidant enzymes, compared to the control. Application of salicylic acid raises the maximum photochemical efficiency of photosystem II and grain yield, at all irrigation conditions. Under 60%, 80%, and 100% irrigation conditions, salicylic acid application increases grain yield by 24.3%, 10.1%, and 4.9%, respectively.
Mokhtar Ghobadi; Hossein Salahi; Mohammad Eghbal Ghobadi; Siroos Mansoorifar
Abstract
In order to study the responses of grain yield of chickpea to drought stress and application methods of nitrogen fertilizer, an experiment carried out as split-plot at Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran, during 2009-10 and 2010-11. The supplementary irrigation ...
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In order to study the responses of grain yield of chickpea to drought stress and application methods of nitrogen fertilizer, an experiment carried out as split-plot at Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran, during 2009-10 and 2010-11. The supplementary irrigation at three levels (1. without irrigation, 2. one irrigation at flowering, 3. two irrigations at flowering and podding stages) as main-plot and the combination of different amounts and application methods of nitrogen fertilizer were as sub-plots. The results showed that grain yield was increased significantly due to increasing of the number of grains per plant and 100-grain weight in response to supplementary irrigation treatments. There was no significant difference in grain yield between one and two supplementary irrigation treatments with 1646 and 1728 kg/ha, respectively. Methods of nitrogen application had significant effects on grain yield and some yield components, but had not effect of 100-grain weight. Foliar spraying accompanied by soil application of N increased significantly grain yield. Finally, to get high grain yield in chickpea we recommend supplementary irrigation at flowering stage and also usage of both nitrogen application methods (soil application + foliar spraying).