| Through the field test, set up four irrigation treatments as 1350 m3·hm-2,1650 m3·hm-2,1950 m3·hm-2,2250 m3·hm-2 and one control group as common furrow irrigation, have researched the effects on growth, yield and water use efficiency of potato by drip irrigation under film. The results showed that: Compared the drip irrigation under film with the conventional furrow irrigation, the potato growth was fast, the plant height, fresh weight per plant, the tuber numbers and fresh tuber weight per plant were total higher than the furrow irrigation, also the added yield was 6416.08 kg·hm-2, increasing yield rate was 21.29%, the water use efficiency was higher than 79.5 (kg·hm-2·mm-1). The water use efficiency of potato by drip irrigation under film has shown a decrease trend with increasing irrigation quantity, but the yield and water consumption were added with the increasing irrigation amount. The yield was the maximum as 39 732.0 kg·hm-2 when the drip irrigation amount was 1950 m3·hm-2. When the irrigation amount increased to 2250 m3·hm-2, the yield was decreased 6 624.5 kg·hm-2, the decrease rate was 16.67%, compared with the irrigation treatment of 1950 m3·hm-2. So considering the aspects of increasing yield and saving water, the suitable irrigation amount was 1650～1950 m3·hm-2 m3, when the effective rainfall was 70 mm more or less in growing period. |