Studying the effect of bio-fertilizers on the yield of Sesamum indicum genotypes under drought stress

Drought stress as the most important abiotic factor for limiting growth, adversely affects crop growth and production. In order to study the effect of bio-fertilizers on sesame genotypes yield under drought stress, an experiment was conducted based on split-split plots experiment in a randomized complete block design with three replications at the Agricultural Research Station, shahid Bahonar University. Treatments included as follow: irrigation base on water evaporation from pan with three levels (50, 90, 130 mm) in the main plots and two types of fertilizers namely nitrazhin and phosphate 2 as two sub treatments and three cultivars: Sirjan, Birjand and Jiroft as sub sub-treatment randomly assigned to subplots The results showed that drought stress caused a significant reduction in the yield of capsules, number of seeds per capsule, biological yield, yield and oil content. The effect of fertilizer on leaf number was significant at 1% level and nitrazine fertilizer had the greatest effect. There was a significant difference in the number of capsules or oil percent between varieties. The maximum performance (7.732 kg/ha) was due to primary stress (50 mm evaporation) and Sirjan cultivar. There is a significant interaction between fertilizer and stress and Nitrazhin fertilizer can reduce the effect of stress on the number of capsules.