不同水稻品种生育后期生理特性的研究

以12个粳稻品种为试材，研究了不同品种产量、生育后期生理性状及其相互关系。结果表明，平均产量列前3位的沈农9418、沈稻2号、辽粳454各产量构成因素多数较高，其余正常，说明其产量构成因素间彼此协调。而任何一个产量构成因素明显偏低的品种，都影响其产量潜力的发挥。单位面积穗数与每穗成粒数的负相关极显，产量与产量构成因素、光合作用的有关参数相关性不显，穗干重占总干物重的比例与产量呈抛物线关系。要进一步提高单产，应该在保证适宜的穗干重占总干物重的比例前提下．增加干物质积累量。

Physiological Characteristics of Diffecent Rice Varieties in Late Growth Peciod

Using 12 rice varieties as materials, yield and physiological characteristics were studied, and the relationship between them were analyzed. The results indicated tha tall components of high-yielding rice plants were more abundant, or normal, and coordina-tive. If one of the components was insufficient, the plant could not produce enough effective grains. There was very significant nega-tive correlation between the number of panicles per unit area and the number of ripened grains per panicle. But there was no signifi-cant correlation between grain yield and yield components, or photosynthesis characteristics. The relationship between yield and the ra-tio of panicle dry weight to the total appeared as a parabolic curve. In order to increase the grain yield, it is necessary to improve dry matter production of the plant, meanwhile to maintain the suitable ratio of panicle dry weight to the whole biomass.