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11 457.46 kg/hm²,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 11 457.46 kg/hm²; 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.