中文摘要：

以长江中下游地区有代表性的50个早熟晚粳水稻品种为供试材料,对不同氮肥群体最高生产力水稻品种的株型进行比较研究。结果表明：株高、基部节间粗、穗长、着粒密度、单穗重均随着氮肥群体最高生产力的增加而增加;生产力处于顶层和高层水平品种具有较好的叶片形态,叶基角和叶片披垂度较小,叶片挺直,茎生叶片在茎秆上的着生高度适宜,层次明显,并有较高的群体LAI、有效LAI和高效LAI,特别是高效LAI,两者的高效LAI均大于5。

英文摘要：

With 50 early-maturing late Japonica rice varieties adopted in the region of Yangtze River as materials, the characteristics of plant type of rice varieties with different productivity level were studied. The results showed that, plant height, width of basal internodes, ear length, grain density and panicle weight of rice significantly increased with the productivity level increasing. Compared with middle- and low-level yield cultivars, top- and high-level yield cuhivars had superior blade shapes, the leaf basic angle and leaf drop angle of the top three leaves were smaller, the leaf were straight, the leaf inserted height were appropriated, and they had higher population LAI, valid LAI and high- efficiency LAI, especially, the high-efficiency LAI was higher than 5.