调亏灌溉对苜蓿水分利用效率和品质的影响

Effects of regulated deficit irrigation on water use efficiency and quality of alfalfa

从高产、优质和高效的三重目标出发，在甘肃秦王川灌区通过大田试验研究了调亏灌溉对苜蓿水分利用效率和品质的影响。结果表明：轻度水分亏缺下（土壤含水率为60Z～65％田间持水量）苜蓿产量较充分灌溉（土壤含水率为65％～70％田间持水量）没有显著差异，而苜蓿的水分利用效率、粗蛋白含量与其余各处理间存在显著差异，其值均达到了最大，分别达2．10kg／m^3和13406．7ug／g。

Based on field experiment, the effects of regulated deficit irrigation on water use efficiency and quality of alfalfa were studied in Qinwangchuan irrigation region in order to obtain high yield, high quality and high efficiency. The results show that the yield of alfalfa is not significantly different between the light water deficit（soil moisture maintained at 60%～65% of field capacity）and full irrigation（soil moisture maintained at 65%～70% of field capacity）, while the water use efficiency（WUE） and crude protein of alfalfa are significantly different between the light water deficit and other treatments. The maximum value of water use efficiency （WUE） and crude protein reached 2.10 kg/m^3 and 13406.7 ug/g, respectively.