高产水稻品种干物质生产特性研究

以3个水稻品种为试材，从物质生产角度研究水稻高产形成的原因。研究结果表明：高的干物质积累总量亦即高的生物产量是获得高产的物质基础。高产和超高产品种的物质生产优势表现在生育中期和后期，其生育中期和后期群体生长率显著高于低产品种。高产品种籽粒产量主要来源于生育后期叶片制造的光合产物，并与其齐穗后具有较高的叶面积指数且持续时间较长密切相关。

Studies on Production Characters of Dry Matter in High-yield Rice

The properties of dry matter product of three different varieties were studied.The results indicated that more total dry matter accumulation was the basis of higher yield.The production superiority of high-yield and super high-yield rice was exhibited during the middle and the late growth stage. The CGR of high-yield and super high-yield varieties was obviously higher than that of low-yield variety during the middle and the late growth stage. The photosynthetic products made by leavies during the late growth stage was main sources of grain yield of high-yield varieties. This result was closely connected with higher LAI and longer duration after the full-heading stage.