Abstract:

By using Flow32 stem flow gauge to measure the tomato plant transpiration under negative pressure irrigation and normal irrigation, the effects of negative hydraulic head irrigation methods on transpiration of tomato and the relationship between plant sap flow and solar radiation intensity were discussed, the variation of water consume on different time and the effects of negative hydraulic head irrigation method on water use efficiency were analyzed. The results showed that plant transpiration under negative hydraulic head irrigation is bigger than the plant under normal irrigation, but the plant transpiration change ruler under two irrigation methods is same, the plant transpiration is influenced by solar radiation intensity; the negative hydraulic head irrigation method can supply water to plant effectively, the irrigation method can reduce invalid soil surface evaporation and underground leakage, and the water use efficiency was increased under the negative hydraulic head irrigation