Effects of Water Stress on Growth and Yield of Rice in Jointing-Booting Stage

Effects of water stress on growth and yield of rice were studied in jointing-booting stage. It showed that effects of water stress on effective panicles, LAI, and plant height of rice were evident. The degrees of rice being affected were positively coorelated with the levels of water stress. The effective panicles of the treated were 26.7% lower than those of the control. Owing to water stress on rice in jointing-booting stage, the rice tillering panicles was restrained, the yield was seriously affected because there were not enough effective panicles in unit area, and fewer of the grains per panicle and light of (1 000-)grain weight. The average yield of the treated was 63.8% lower than that of the control. The average biomass of the treated was 25.9% lower than that of the control. The average stem and leaf weight of the treated were 8.3% higher than those of the control.