大穗型水稻超高产产量形成特点及物质生产分析

ANALYSIS OF THE FORMATION OF SUPERHIGH YIELD OF BIG PANICLE RICE AND ITS DRY MATTER PRODUCTION

为探讨大穗型水稻品种高产机制，对其产量形成的特点进行了分析．结果表明：超高产水稻二次枝梗结实率有较大的提高；其前期物质积累多，后期转运能力强，光合产物能更多地运送到稻穗中；齐穗期具有更高的叶面积指数，后期叶面积指数衰减慢，叶片功能期长，叶日积高．

The yield formation characteristics of big panicle rice with superhigh yield were analysed. The results showed that the big panicle rice of superhigh yield had greatly increased in seedsetting percentage of secondary branches of panicle,it had accumulated more dry matter at early growth period and transfered more photosynthetaes to panicle at late growth period.The rice of superhigh yield had higher LAI at headingstage,and its LAI declined more slowly at late period,it had longer leaf available period and higher Leafdayintergration (LAI×Growth days).