本实验以盆栽的方法于1979和1980年的早季进行。研究了杂交水稻生育后期不同供水条件对植株的水分吸收、~(32)P 的吸收和分布以及籽粒灌浆充实的效应。结果表明,供水不足,稻株伤流量减少,伤流液中~(32)P 含量下降更多,从而导致稻株~(32)P含量低,~(32)P在穗分布的百分率亦低。同时,植株干重,结实率和粒重随土壤含水量减少而明显下降。但杂交水稻汕优2号与常规稻桂朝2号相比,前者对缺水更为敏感。初步认为,杂交水稻生育后期不宜断水过早,须进行合理的水浆管理,以利稻株对磷素的吸收、转运和籽粒灌浆充实。 The experiment was conducted in potted plants in the early 1979 and 1980 season. The effects of different water supply conditions on water uptake, distribution and absorption of ~ (32) P and grain filling in hybrid rice at late growth stage were studied. The results showed that the water deficit of rice plants decreased and the content of ~ (32) P decreased more in the effluent, resulting in the lower content of ~ (32) P and the percentage of ~ (32) P in the spike . At the same time, plant dry weight, seed setting rate and grain weight decreased significantly with the decrease of soil water content. However, the hybrid rice Shanyou 2 compared with the conventional rice Guizhao 2, the former is more sensitive to water shortage. It is preliminarily believed that the hybrid rice should not be dehydrated too early in the later growth period, and proper water slurry management should be carried out to facilitate the absorption, translocation and grain filling of rice plants.