This experiment on soybean yield and yield components was conducted in 2002 using a randomized full block design with split plots and three replications. The primary factors of under-irrigation are s3 (optimal irrigation as a control), S2 (water cut from the beginning to the end of podding), and S (water cut from the beginning to the end of flowering), as well as the secondary factor of potassium fertilizer at three levels of zero (K0), 50 (K50), and 100 (K100) kg K20 per hectare. The control treatment (S) produced the highest grain yield of 4168.2 kg/ha, whereas stress in the flowering stage produced the lowest yield of 4426.6 kg/ha (S1). The greatest grain yield was 3502.2 kg/ha in the K50 treatment, whereas the lowest grain yield was 3159 kg/ha in the KO treatment. Grain yield rose as the number of grains in the pod grew, according to the findings. The harvest index was highest in the optimal irrigation condition, and when drought stress was applied from blooming to pod stage, the harvest index dropped from 26.1 to 21.6 percent. The number of pods per plant and grain weight was the yield components that were most susceptible to stress. The number of grains per pod, for example, exhibited a rather high level of stability and was unaffected by drought stress treatments or potassium fertilizer. S3 treatment had the highest grain yield, harvest index, biological yield, and leaf area index among the stress treatments, whereas S1 treatment had the lowest grain yield, harvest index, and biological yield. According to the findings, the K50 fertilizer treatment had the most seeds, pods per plant, seeds per pod, harvest index, biological yield, and grain yield among the fertilizer treatments, while the KO treatment had the least of these characteristics.
