北方粳稻不同穗型品种冠层特征与干物质生产研究

本文对北方粳稻不同穗型品种的特征与干物质生产和产量的关系进行了研究，结果表明，不同穗型品种，对Ｎ肥高低反应不同，冠层发展动态与干物质生产速率也有明显差异，随着施Ｎ水平的提高，不同穗型品种抽穗前叶面积增长速度增大，抽穗期的ＬＡＩ与抽后群体干物质生产速度和产量间呈二次曲线回归关系，获得最高产量的最适ＬＡＩ与获得最大干物质生产速度的最适ＬＡＩ接近。抽穗后群体干物质生产速度与产量境也呈现极显著的正相关。

Studies on canopy properties and its relation to dry matter producton in japonica rice varieties with different panicle types in north

Using japonica rice varieties with different panicle types,studies were made on canopy properties in relation to dry matter that varieties responsiveness to nitrogen supply varied with panicle types,and there were significant differences in the canopy development and the rate of dry matter production among varieties with different pinicle types.The more was the nitrogen supply,the more differences of declining rate of leaf area after heading would be,and the less would be the differeces of increasing rate of leaf area before heading among varieties with different panicle types.The LAI at the heading stage had a significant quadratic regression relationship with yield and the rate of dry matter production after heading.The results also indicate that the LAI leading to maximum yield was basically consistent with the LAI conductive to maximum rate of dry matter production,and the yield was positively corelated with the rate of dry matter production after heading.