| In this field experiment, Qingshu 168 was used as material, and eight water deficit treatments (RD1-RD8) and one full irrigation control group (CK) were performed in desert oasis region northwest China. The effects of soil water deficit on potato growth, yield and water use were studied under different drip conditions. The results showed that the yield, harvest index, water use efficiency and irrigation water use efficiency of potato under mulched drip irrigation were significantly affected by water deficit. The slight water deficit during tuber formation showed the best effect, of which the yield was slightly decreased, but the water use efficiency, irrigation water use efficiency and harvest index were significantly higher than those of other water deficit treatments and CK control group. The degree of water deficit seriously affect the amount of water consumed at different growth stages, and the degree of water deficit positively correlated with the water consumption. Leaf area duration and leaf area index changed in the similar trend, with the leaf area index showing a single peak curve. In conclusion, muchled drip irrigation can improve the yield, water use efficiency of the potato in desert oasis region. |