棉花限水灌溉与氮肥化学控制的产量效应研究

Study on limited irrigation and N fertilizer and DPC regulation for yield effect of cotton

利用简易坑测与大田试验相结合方法,采用三因素正交旋转回归设计,对限水灌溉与施N肥、化学控制进行组合研究,并建立了3项技术措施对皮棉产量效应模型。经模拟寻优,筛选出皮棉产量≥1875kg/hm2的优化组合方案,即灌水量678.8~821.4m3/hm2,施N肥285.9~363.4kg/hm2和喷施缩节胺45.8~51.3g/hm2。并根据不同处理生育动态优化模型,用筛选出的优化组合方案进行模拟,获得优化栽培棉花均衡生长发育的优化动态模型及相应定量化实施诊断指标。

Based on the experiment of limited irrigation in the plot which was surrounded with plastic film towards 1.3m of underground,limited irrigation,N application and DPC regulation were comprehensively studied in the field by rotational regression design,and the model of effect of three factors on lint yield was established.Through simulation and selection,the optimum agronomic measure for lint yield≥1875kg/hm^2 was obtained,i.e.the amount of irrigation,N application and DPC regulation was 678.8～821.4m^3/hm^2,285.9～363.4kg/hm^2 and 45.8～51.3g/hm^2 respectively.According to the optimum growth model,the optimum model on proportional development and the quantitative standard for practice examination were achieved by selected combination program.