不同水分管理模式对双季稻生长及产量的影响

本试验模拟我国南方双季稻作区不同的水分条件，设置4种灌溉处理，研究不同的灌溉条件对水稻生长及产量的影响。结果表明：淹灌和天灌的叶面积在抽穗期达到最大．而湿灌和配灌在孕穗期达到最大，此后叶面积减小的趋势表现为天灌最快，淹灌最慢。早稻以淹灌的生物量最大，而晚稻以配灌最大；早稻各处理产量差别不大，以淹灌的产量最高，天灌的产量因水文年型不同而有较大的波动，晚稻各处理的产量差别加大，特别是天灌，产量难以保证，最大减产率达到22．9％，而配灌产量最高；各处理多年平均灌溉水分生产率为1．48kg／m^2，早稻较晚稻高，其中湿灌的水分生产率最高。

Effects of Different Water Regime on Growth and Yield of Paddy

In this article,effects of different water regime on the growth and yield of paddy were studied with simulation of different water condition in southern China. The four treatments were set in the experiment:basin irrigation(BI),normal irrigation(NI),controlled moist irrigation(CI),rainfed paddy field(RI).The results show that the leat area of both BI and RI reaches the peak point at the flowering stage, but that of the other two treatments does at booting stage; afterwards, the leaf area descends. In all the treatments, the trend of leaf area of RI is the fastest. The biomass of BI is the highest in early rice and that of NI is the highest in late rice. The yield discrepancy between each treatment in early rice is less than that of late rice. RI's yield decreased 6.33% in early rice and 22.95% in late rice compared with the highest. A fouryear research shows that the yield of BI is the highest in early rice and that of Ni is highest in late rice. A tenyear field experiment shows that waterirrigated productivity is 1.48kg/m~3, and the productivity of early rice is much more higher than that of late rice. Of the four treatments, CI is the highest waterirrigated productivity.