水稻直播栽培高产机理研究初报

Preliminary studies on mechanism of high yield of direct seeding rice

在前几年试验观察研究的基础上 ,1998～ 1999年设立水稻直播高产机理栽培试验。结果表明 ,直播比移栽对照增产 ,其增产机理在于 :直播稻生育进程加快 ,分蘖早生快发 ,低节位分蘖成穗率高 ,易获得足够的穗数 ;群体结构协调 ,光合速率高 ,光合产物累积速度快 ;植株养分吸收能力。

WT5”,6BZ]The studies on the mechanism of high yield of direct seeding rice were carried out in 1998～1999 on the basis of previous experiments.The results showed that yield was higher by direct seeding than by transplantation.The yield increase of direct seeding rice over transplanted rice were contributed by:(1)increased panicles due to high panicle bearing of tillers at lower nods after accelerated development;(2)improved photosynthetic rate and matter auumulation because of the proper population structure; and (3)improved nutrient uptake,root vigor and lodging resistance of rice plants.