膜下滴灌条件下水磷效应对棉花产量和水分利用率的影响

Effects of Water and Phosphorus on Yield and Water Use Efficiency of Cotton with Drip Irrigation under Mulch

通过田间实验设计磷(P)和水(W)两个因素,研究膜下滴灌棉花不同水磷处理对其产量和水分利用效率的影响。结果表明:不同水、磷用量处理间棉花产量差异显著,棉花籽棉产量随着灌水量和施磷量的增加都呈现先增加而后降低的趋势。棉花水分利用效率的最大值出现在P2W2(P2O5120 kg/hm2;灌水量4800 m3/hm2)处理,干物质和籽棉的水分利用效率分别为41.46和13.95 kg/(hm2.mm),这表明合理的水、磷配比有利于棉田水分利用效率的提高。

Through a field experiment two factors（phosphorus and water）was designed,effects on yield and WUE（water use efficiency）were studied through different phosphorus and water during the whole growth period of drip irrigation under plastic film for cotton.Results showed that there were significant differences between different phosphorus and water in cotton yield;the cotton yield increased with water and phosphorus being improved at first and then decreased.The largest WUE of dry matter and yield was P2W2 treatment（P2O5：120 kg/hm2;Water：4800 m3/hm2）,41.46,13.95 kg/（hm2·mm）,respectively.It suggested that the WUE could be improved through reasonable ratio of water use efficiency in cotton fields.