亏缺灌溉对冬小麦耗水规律及产量的影响

Effect of Deficit Irrigation on Water Consumption and Yield of Winter Wheat

通过对冬小麦不同生育阶段进行不同程度水分亏缺的测坑试验,对比分析了不同水分处理对冬小麦耗水特性及产量的影响,并选用Jensen模型对产量与阶段耗水量的关系进行分析,结果表明亏缺灌溉有利于冬小麦耗水量的降低,但同时也降低冬小麦的产量;抽穗-灌浆期的水分对产量影响最敏感,应避免在该阶段出现水分亏缺现象;播种-拔节期和拔节-抽穗期可进行轻度水分亏缺,有利于冬小麦节水高效,灌浆-成熟期的水分对产量影响最不敏感,可进行水分亏缺调控,降低冬小麦的灌溉水量。

Through a series of leaching-pond experiments, the effect of different degree deficit irrigation on the water consumption and yield of winter wheat is analyzed. The Jensen model is selected to describe the relationship between the yield and water consump tion in different growth stages. The results show that deficit irrigation is hene{icial for the decrease of the water consumption of win- ter wheat, while the yield decreases as well. The effect of deficit irrigation on the yield of winter wheat is the most sensitive during the heading and grouting stage, which should be avoided. The mild deficit irrigation is good for the higher water use efficiency during the seeding-jointing and jointing-heading stage. Deficit irrigation shows little effect on the yield of winter wheat in grouting-maturity stage, during which some measures could be used to regulate the water deficiency and decrease the total water consumption.