Abstract:In order to explore the effect of different irrigation amount on soil water and salt transport and growth characteristics of Spring Maize in Hetao Irrigation District (HID) under ridge with film mulching-furrow irrigation system, field experiments were carried out in Shuguang experimental station of HID from April to October, 2019. Five typical irrigation amounts (T1: 200 mm, T2: 275 mm, T3: 350 mm, T4: 425 mm, T5: 500 mm) were arranged to study the characteristics of soil water and salt transport under ridge with film mulching-furrow irrigation and its effects on yield and water use efficiency (WUE) of spring maize. The results showed that the soil water storage of 0—120 cm soil layer in T4 and T5 treatments was close, and the water consumption of maize in T5 treatment was significantly higher than that in other treatments. The average salt storage in T1~T5 treatments were 48.37, 26.84, 19.34, 21.38, and 22.79 t/hm2, respectively. The salt storage quantity of T1, T2, and T5 treatments increased by 27.33, 1.54, and 5.88 t/hm2 respectively, and T3 and T4 decreased by 10.04 and 3.42 t/hm2 so that the salt accumulation showed a "V-shaped" change. With the increase of irrigation amount, WUE first increased and then decreased, and the yield increased first and then stabilized. Under the irrigation amount of 200 mm and 275 mm, the soil was seriously short of water, and the salt storage was high. The soil water and salt environment of 350 mm treatment was suitable, where the yield and water use efficiency were high, and the deep layer leakage of 425 and 500 mm was large, and the salt storage quantity tended to increase gradually. Therefore, on the premise of reducing the amount of water diversion from the Yellow River, the irrigation amount of 350 mm under ridge with film mulching-furrow irrigation can achieve the goal of water saving, salt control and yield increase in HID.