Field experiment was conducted to determine the appropriate supplemental irrigation amount of winter wheat at the jointing stage with the ridge and furrow rain harvesting cultivation and explore the difference of the film mulching on soil water conservation and water-saving effects in semihumid and drought prone areas. The ridges covered with plastic film (P)and biodegradable film(J), combined with rain-fed (I0), supplementary irrigation 20 mm (I1), 40 mm (I2), 60 mm (I3) at the jointing stage were set up to analyze and compare soil water storage, winter wheat yield and water use efficiency (WUE) changes under different supplemental irrigation amounts and mulching patterns at 0-200 cm soil depths. The results showed that the film mulching could significantly improve the soil water storage of 0-100 cm, the effect of conserving soil moisture of J was similar to that of P at the seedling stage and lower than that of P after the seedling stage. Soil water storage of the film mulching was significantly lower than that of CK at 100-200 cm after the seedling period, but there was no significant difference between P and J. The irrigation measures can significantly increase the soil water storage of 0-200 cm, and the soil water storage in I3 is the highest, that in I2 is the second. The winter wheat yield and WUE of the film mulching were obviously higher those of CK, while the winter wheat yield and WUE of P were slightly higher than those of J, but there was no significant difference. The average grain yield of I2 was 1.50% lower than that of I3 under two different film coverings. But the average WUE and irrigation WUE of I2 were the highest. Compared with I3, the average WUE and irrigation WUE of I2 were improved by 2.4% and 37.5%, respectively. Therefore, the ridge with biodegradable film, furrow planting, combined with I2 is the best treatment of alleviating residual film pollution, water saving and high yield.
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