作物调亏灌溉的适宜时间与调亏程度的研究

Proper Growth Stages and Deficit Degree of Crop Regulated Deficit Irrigation

摘要: 作物调亏灌溉是建立在作物与水分关系基础上的一种节水高产灌溉技术。根据陕西长武、甘肃民勤等地的田间试验资料分析了适度缺水对作物产量的有益效应，表明调亏灌溉的适宜时段应该在作物的早期生长阶段。陕西长武和甘肃民勤小麦和棉花的试验结果表明，其水分亏缺程度可达到田间持水量的45%～50%，而对作物的产量没有不利影响，但可明显提高作物水分利用效率。并且讨论了调亏灌溉目前存在的一些问题。

Abstract: Crop Regulated Deficit Irrigation (RDI)，based on the crop-water relations，is an irrigation technique with high yield and water use efficiency. The beneficial effect of moderate water deficit was analyzed using the data of field experiments in Shaanxi，Gansu and Xinjiang. It showed that RDI should be applied at the early growth stage. The degree of water deficit can reach 45%～50% of field capacity，which has no bad effect on crop yield and can increase crop water use efficiency obviously. And some problems of RDI were also disscussed.