University of Tabriz Journal of Agricultural Science and Sustainable Production 2476-4310 35 3 2025 10 22 Effect of on-farm Seed Priming and Foliar Application of Amino Acids on some Growth Indices and Yield of Rainfed Wheat under Supplementary Irrigation Conditions Effect of on-farm Seed Priming and Foliar Application of Amino Acids on some Growth Indices and Yield of Rainfed Wheat under Supplementary Irrigation Conditions 77 96 20547 10.22034/saps.2024.59364.3142 FA Narjes Hojati Fahim Department of Plant Production and Genetics, Faculty of Agriculture, Bu-Ali Sina University Mohammad Ali Aboutalebian Agronomy Department, Faculty of Agriculture, Bu-Ali Sina University Mehrdad Chaichi Department of Seed and Plant Improvement, Agricultural and Natural Resources Research and Training Center, Hamedan, Iran Journal Article 2023 11 26 <strong>Abstract</strong> <strong>Background and Objective</strong>: This research was conducted with the aim of investigating the interactions of on-farm seed priming, foliar application of two amino acids, and supplementary irrigation on improving some growth indices and yield of rainfed wheat. <strong> </strong> <strong>Materials and Methods</strong>: The experiment was conducted during the 2021-2020 cropping season at the research farm of the Agricultural Research Center of Hamedan as a three-factor factorial experiment in a randomized complete block design with three replications. The first factor was supplementary irrigation at four levels: planting, flowering, grain filling, and no supplementary irrigation. The second factor was on-farm seed priming (primed and non-primed). The third factor involved foliar application of amino acid (methionine, lysine, and pure water). <strong> </strong> <strong>Results</strong>: Supplementary irrigation during the flowering and grain filling increased the maximum leaf area index by 45% and 35%, respectively, and the maximum total dry matter by 24.3% and 10.7%, respectively. The maximum leaf area index and total dry matter were 7.7% and 6% higher, respectively, with seed priming compared to no-priming. The application of both amino acids increased the maximum leaf area index and crop growth rate by 6.9% and 12.5%, respectively, compared to pure water. The relative growth rate increased by 12.5% with supplementary irrigation during the flowering only. Irrigation during the grain filling with the application of methionine was more effective in enhancing yield compared to lysine. Foliar application of both amino acids in combination with supplementary irrigation at flowering increased grain yield by about 45% compared to the control treatment (no supplementary irrigation and no amino acids). <strong> </strong> <strong>Conclusion</strong>: Supplementary irrigation during the flowering, along with foliar application of amino acids and on-farm seed priming, can lead to the improvement of growth and yield of rainfed wheat by reducing drought stress intensity.   <strong>Abstract</strong> <strong>Background and Objective</strong>: This research was conducted with the aim of investigating the interactions of on-farm seed priming, foliar application of two amino acids, and supplementary irrigation on improving some growth indices and yield of rainfed wheat. <strong> </strong> <strong>Materials and Methods</strong>: The experiment was conducted during the 2021-2020 cropping season at the research farm of the Agricultural Research Center of Hamedan as a three-factor factorial experiment in a randomized complete block design with three replications. The first factor was supplementary irrigation at four levels: planting, flowering, grain filling, and no supplementary irrigation. The second factor was on-farm seed priming (primed and non-primed). The third factor involved foliar application of amino acid (methionine, lysine, and pure water). <strong> </strong> <strong>Results</strong>: Supplementary irrigation during the flowering and grain filling increased the maximum leaf area index by 45% and 35%, respectively, and the maximum total dry matter by 24.3% and 10.7%, respectively. The maximum leaf area index and total dry matter were 7.7% and 6% higher, respectively, with seed priming compared to no-priming. The application of both amino acids increased the maximum leaf area index and crop growth rate by 6.9% and 12.5%, respectively, compared to pure water. The relative growth rate increased by 12.5% with supplementary irrigation during the flowering only. Irrigation during the grain filling with the application of methionine was more effective in enhancing yield compared to lysine. Foliar application of both amino acids in combination with supplementary irrigation at flowering increased grain yield by about 45% compared to the control treatment (no supplementary irrigation and no amino acids). <strong> </strong> <strong>Conclusion</strong>: Supplementary irrigation during the flowering, along with foliar application of amino acids and on-farm seed priming, can lead to the improvement of growth and yield of rainfed wheat by reducing drought stress intensity.   https://sustainagriculture.tabrizu.ac.ir/article_20547_053c667d4de82bcfa429ea1675c525c8.pdf