辽西半干旱区玉米有限补灌制度研究初探

对辽宁省西部半干旱地区对该区玉米的有限补灌制度进行了初步研究。在不同的补灌定额和补灌次数条件下对玉米的产量效应和耗水量以及水分利用效应进行了分析,通过分析表明,补灌定额与产量之间差异显著水平,耗水量与产量之间差异显著。开花期为作物需水最敏感的时期。并且补灌效果最好的是在开花期1次补灌,其次是灌浆期和拔节期2次补灌。并且以高产和节水以及水分高效利用为目地,确定出试验年降水量条件下的补灌制度为:补灌时间为开花期补灌,补灌定额为67.5 mm。

A Preliminary Study on Limited Supplementary Irrigation System of Corn in the Semi-arid Area of Western Liaoning

The preliminary study on limited supplementary irrigation system of corn in the semi-arid area of western Liaoning was carried out.The yield effect,water consumption and water use efficiency of corn were analyzed under different norm and frequency of supplementary irrigation,the results indicated that the difference between supplementary irrigation norm and frequency was significant,between water consumption and yield was also.The flowering stage of crop is the principal sensitive phase to water.The effect of the first supplementary irrigation was the best during the flowering stage,next came the second supplementary irrigation during filling and jointing stage.This article takes high yield,water saving and high efficient utilization of water as the purpose to have determined supplementary irrigation system in case of test annual precipitation,it means that supplementary irrigation period is the flowering stage,and supplementary irrigation norm is 67.5mm.