To study the effects of water disposal on the growth and yield of rice

the method of the pot culture was adopted in this experiment

and three levels were designed in tillering stage

booting stage

blooming stage and milk stage of rice.Comparing with the treatment of keeping water flooding

there were three other treatment.Treatment H1

soil water potential was 0 kPa(90%~100% of soil saturation contains water);treatment H2

soil water potential was-30 kPa;treatment H3

soil water potential was-50 kPa.The results showed that in tillering stage the effects of water stress on tillering number

LAI

and plant height of rice were evident

the yield was seriously affected with no enough effective panicles in unit area

and the average yield of the treated was 29.5% lower than that of the control.In booting stage

owing to water stress on rice

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 of panicle and light of weight of 1000-grain.The average effective panicles of the treated was 26.7% lower than that of the control

the average yield of the treated was 63.8% lower than that of the control.In blooming stage

1000-grain weight of treatment H1 was 12.9 % higher than that of the control

and the difference was extremely significant(P<0.01)

the yield of treatment H1 was higher than that of the control

the yield of treatment H2 and treatment H3 was lower than that of the control

and the difference was extremely significant(P<0.01).In milking stage

1000-grain weight of treatment H1 was 11.2 % higher than that of the control

and the difference was extremely significant(P<0.01)

the yield of treatment H1 was 12.76% higher than that of the control

and the difference was extremely significant(P<0.05).