Study Effect of Supplemental Nutrition on Yield, Yield Components and Grain Protein Content of Wheat Cultivars under Drain Water Irrigation

BACKGROUND: The macro and micronutrients play an important role in the crop nutrition and thus they are important for achieving higher yields, better growth and development of plants. OBJECTIVES: This study aimed to investigate the effect of supplemental nutrition (chemical and organic fertilizer) on quality parameters and grain yield of wheat cultivars under irrigation condition with drain water of farms. METHODS: This experiment was carried out as a split-split plot in a randomized complete block design with three replications. The treatments included irrigation at two levels of drain water and pure water irrigation in the main plot, fertilizer compounds at six levels, growth promotion and high potassium in sub-plot and sub-sub plot including wheat cultivars (Mehregan, Shoosh, and Chamran2). RESULT: The results indicated that the traits of grain yield, harvest index, number of tillers, number of spikelet per spike, number of grain per spike were affected by fertilizer treatment and grain yield, biological yield, and harvest index were affected by irrigation. The number of grains per spike in irrigation with pure water had a higher average. The highest thousand grain weight and the number of tillers were obtained in Chamran2 cultivar. The highest grain protein content was achieved in Mehregan cultivar. The results of correlation analysis revealed that the number of tillers had a significant direct correlation with the variables of number of spikelet per spike, number of grains per spike, and grain yield. In examining the interaction of treatments, the highest grain yield was obtained in the application of humic acid seed inoculation and growth promotion of Shoosh wheat cultivar under drain water irrigation. CONCLUSION: the highest amounts of grain yield were obtained approximately 6925 kg per hectare by applying humic and growth-promoting fertilizers in irrigation conditions with drain water of fields in Shoosh wheat cultivar.