The Primary Benefit Analysis of Alfalfa Grown under Regulated Deficit Irrigation in Qinwangchuan Irrigation Region

Based on field experiment the benefit of growing alfalfa under regulated deficit irrigation(RDI) was analyzed primarily in Qinwangchuan irrigation region in order to obtain high yield,high quality and high efficiency.The results show that the yield and economic net benefits of alfalfa were not significantly(P0.05) different between the light water deficit,which soil moisture maintained at 60%～65% of field capacity and full irrigation which soil moisture maintained at 65%～70% of field capacity.The water use efficiency(WUE) and crude protein of alfalfa were significantly different(P0.05) between the light water deficit and other treatments.And the above two indexes reached to the maximum with 2.10 kg/m~3 and 13406.7 ug/g respectively.