棉花产量和生长指标对水肥响应关系

Response relationship of cotton yield and growth to water and fertilizer

通过设置不同滴灌施肥处理,研究不同滴灌施肥条件下水肥水平对棉花产量的影响,并采用皮尔逊相关分析、典型相关分析和灰色关联度分析方法对棉花产量和生长性状进行相关分析。结果表明,籽棉产量随灌水量和施肥量变化呈椭圆形二次曲线变化趋势;典型相关分析结果显示,株高、叶面积指数、果枝数、地上干物质量和根干物质量增加有利于籽棉产量和有效铃数增加,而百铃质量与果枝数呈负相关关系;灰色关联度分析结果显示,株高、LAI和地上干物质量与产量关系密切。灌水量为411 mm,施肥量为305-122-61 kg/hm2(N-P2O5-K2O)是当地较优的灌溉施肥模式。

To uncover the group indicators influencing cotton yield and obtain a better water and fertilizer supply mode for drip irrigated cotton in Xinjiang, the correlations of cotton yield and growth under different water and fertilizer supply modes were analyzed through different drip fertigation treatments. The results show that seed cotton yield changed with irrigation water and fertilizer in elliptic conic function. Canonical correlation analysis show that the seed cotton yield and effective number of fluid increased as the plant height,leaf area index, number of branch, aboveground dry matter and root dry matter increased, whilst the fluid quality was negatively related with the branch number. Grey correlation analysis shows that the seed yield was closely related to the plant height,leaf area index and aboveground dry matter. The combination of irrigation amount of 411 mm and the fertilizer rate of 305 -122 -61 kg/hm^2 （N -P2O5 -K2O） are considered as an optimal fertigation mode for local cotton.