沈阳地区高产水稻群体主要农艺性状对产量的影响

Effects of Main Agronomic Characters on Grain Yield of High Yielding Rice Plant Populations

研究结果表明 ,水稻群体存在穗粒矛盾。穗数与产量间关系呈抛物线形 ,在辽宁沈阳地区水稻每公顷最适穗数在3.0×106～3.8×106之间。每穗颖花数、每穗成粒数、一次枝梗数和二次枝梗数与产量均呈直线线性相关 ,但增产效果不同。

The results of experiment showed that the individuals were conditioned each other in rice plant populations. The relationship between grain yield and the number of panicles per unit area could fit in quadratic equation. The yields had significantly positive correlation with the number of spikelets, ripened grains, primary rachis-branches and secondary rachis-branches per panicle, but the effects of increasing yield were different. The available ways to obtain high yields in the cold area of northern China would be to increase grain number per panicle and to stabilize or to increase simultaneously panicle number per unit area.