补充供水对半干旱区旱地春小麦水分亏缺的补偿效应研究

大田试验设１１个水分处理，包括不灌溉（对照）和灌１、２次水、灌时期分别为春小麦三叶期、拨节期、抽穗斯和开花期。试验结果表明：三叶期灌溉的４个处理消除了苗期水分亏缺，通过提高小穗和数穗粒数而明显增产。

A Study of the Water Compensatory Effects on Spring Wheat in the Semiarid Regions

The field trial was done in Dingxi including 11 treatments with no irrigating (control) and irrigating one or two times at the seedling, jointing, heading and blooming stages of spring wheat. The result showed that the 4 treatments irrigating at the seedling stage of spring wheat eliminated the soil water deficit at the seedling stage, increased the yield obviously by increasing the rate between spikelets and spike and the rate between kernels and spike. So it shows that in the semiarid regions, irrigating at the seedling stage of spring wheat is more effective than that at the jointing stage (the physiological critical stage of water requirement of wheat) when soil water is deficit and the precipitation is insufficient.