Abstract: Under the studies of physiological-ecological laws on high-yielding culture of rice (Oryza saliva L.) in the plateau in 1983-1985, we had made a comparison between dry-matter production and partitioning after top dressing with nitrogenous fertilizer (urea) of rice grown at three localities, i. e., Yuanjiang (dry-heat river valley about 400 m altitude) , Kunming (warm-cool plateau lake-shore about 1900 m altitude) and Lijiang (cold-cool plateau area about 2400 m altitude) in Yunnan province. The treatments of top dressing, on the basis of 20 kg/mu urea applied as a basal dressing, were applied with 10 kg/mu urea at the young panicle differentiation, spikelet differentiation and reduction division stage (these stages of fertilizer application are briefly known as early, middle and lain car manuring) respectively.

Key words: Rice

摘要： 1983——1985年在云南省的元江（海拔约400米）、昆明（约1900米）和丽江（约2400米）三地种植的水稻，在以每亩施用20公斤尿素底肥的基础上，分别作了不同时期的氮素（每亩10公斤尿素）追肥试验，比较了各地之间和不同时期追肥处理之间在不同生育期中水稻地上部干物质的生产和分配。并对所获得结果的生理基础和气候条件进行了讨论。

关键词: 水稻, 干物质生产, 干物质分配, 次库, 追肥, 氮素肥料