高产水稻品种干物质生产特性研究

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

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。

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.