The Water Consumption and Yield Effect Under Regulated Deficit Irrigation of Spring Broad Bean

Based on field experiment,the effect of regulated deficit irrigation on water consumption and yield effect of broad bean were studied in Qinwangchuan irrigation region in order to saving water and obtain high yield.The result shows that severe wa- ter deficit in seeding and jointing seriously affect broad bean's growing.It made leaf area index and plant high decrease 26.00%, 21.36%,38.62%,34.78% and the influence continued a long time,but light water deficit in seeding and jointing hardly affects the growth of broad bean.High water deficit made water consumption decrease 47.97% and 46.58% in corresponding stage compared with CK.Deficit water can made water consumption increase 21.84%,7.28%,5.34% and 2.43% in later period (mature period).The WUE was increased 13.48%,58.43% and 24.62% with deficit water in seeding and light deficit water in jointing but the WUE decreased 46.58% with high deficit water in jointing.Deficit water in early stage can increase the water consumption and WUE of later growth stage.Light water deficit had increased yield 9.09% and 14.05% but high water deficit decreased yield 1.65% and 7.44% compared with CK.