The effect of different water levels on the water yield relationships of the second crop sesame plant in semi-arid climate conditions.

This research was carried out in Siirt University, Faculty of Agriculture, during the growing season of the second crop sesame plant in 2022. It was applied in semi-arid climatic conditions in order to examine the water-yield relationships, yield and quality characteristics of the second crop sesame plant under limited irrigation applied with the drip irrigation method. The research was carried out in randomized blocks split plot design with three replications. Three registered sesame cultivars were used in the experiment. The different irrigation applications in the study were full irrigation with 100% (I100) of the water consumed in a 90 cm soil layer every seven days, and partial irrigation where 70% (I70) and 35% (I35) of the full irrigation were applied. The irrigation program was arranged to be every eight days and the irrigation subjects were formed from three different irrigation levels. Soil water content change was measured with the A-Pann evaporation pan. In the research; plant height, number of side branches, number of capsules per plant, first branch height of the plant, crop water stress index (CWSI), water use efficiency (WUE), Irrigation water use efficiency (IWUE), and yield values were investigated. As a result of the research; according to plant height irrigation issues; It varied between 802,92-11229,77, 711,22-894,44 according to genotypexirrigation interaction subjects; 403,004-1348,334 according to genotypex interaction subject. The number of capsules according to irrigation subjects; It varied between 57-114,22, 74,55-88,44 according to genotype, 52,33-126,00 (pcs/plant) according to genotypexirrigation subject interaction. The number of side branches according to genotypexirrigation subject interactions; It was determined as 1,66-4,33. According to CWSI irrigation topics;0,30-0,64, 0,41-0,53 according to genotype and 0,26-0,69 according to genotypexirrigation subject interaction. IWUE values according to irrigation issues; It varied between 1,83-2,23, 1,82-2,33 according to genotype, and 1,60-2,58 according to genotypexirrigation subject interaction. WUE values according to irrigation subjects; It varied between 1,42-1,93 and 1,43-1,85 according to the genotype. Yield values according to the subject of irrigation; (I35 and I100) 802,92-1229,77, according to genotype (Boydak, Arslanbey) 711,22-894,44 and according to genotypex irrigation (HatipoğluI35, ArslanbeyI100), 403,00-1348,33. While the lowest seed yield was obtained from the Boydak genotype, the highest seed yield was obtained from the Arslanbey genotype. The irrigation issue with the lowest efficiency was determined as I35. Keywords: A-Pann evaporimeter, Drip irrigation, Second product sesame, Deficit irrigation