机插籼稻干物质积累和抗倒伏能力分析

Analysis of Dry MatterAccumulation and Lodging Resistance of Machine-Transplanted Indica Rice

为探讨机插籼稻品种的干物质积累、抗倒伏能力与产量的关系,对云南省大面积种植的19个机插籼稻品种的干物质量、倒伏指标、产量等农艺性状进行了调查分析。结果表明,机插籼稻平均产量为11457.46 kg/hm^(2),分蘖至拔节期、拔节至抽穗期、抽穗至成熟期的干物质积累量分别占产量的23.14%、30.22%、83.71%,茎鞘物质输出率、转化率分别为29.68%、22.38%;倒伏风险由大到小为N5节间>N4节间>N3节间;N5、N4、N3节间的倒伏指数与产量相关性不显著,抽穗后的干物质积累与产量相关系数最大,为0.92,达极显著水平。结果可为机插籼稻高产品种筛选提供依据。

In order to explore the relationship between dry matter accumulation,lodging resistance and yield of machine-transplanted indica rice varieties,the dry matter accumulation,lodging index,yield and other agronomic characteristics of 19 machine-transplanted indica rice varieties planted in a large area in Yunnan Province were investigated and analyzed.The results showed that the average yield of 19 machine-transplanted indica rice was 11457.46 kg/hm^(2);the dry matter accumulation from tillering to jointing,jointing to heading,and heading to maturity accounted for 23.14%,30.22%,and 83.71%of the yield,respectively;the export percentage and translocation percentage of stem-sheaths were 29.68%and 22.38%,respectively.Lodging risk from high to small is N5 internode>N4 internode>N3 internode.There was no significant correlation between lodging index of N3 internode,N4 internode and N5 internode.The correlation coefficient between dry matter accumulation after heading and yield was the highest,at 0.92,reaching a very significant level.The results could provide a theoretical basis for the selection of high-yield varieties of machine-transplanted indica rice.