Enhanced maize yield and water-use efficiency via film mulched ridge–furrow tillage with straw incorporation in semiarid regions

摘要

ABSTRACT Film mulched ridge-furrow tillage (FMRF) with straw incorporation (S) can efficiently improve rain-fed maize yield and water use efficiency (WUE). The key mechanisms were investigated via a 3-year consecutive FMRF and S interactive experiments CP (conventional planting, Control), CPS, FMRF, FMRFS from 2014 to 2016. In comparison with CP, FMRFS increased the temperature by 1.8°C to 4.8°C and the soil water content of 0–200 cm soil profile (W200 ) by 98.0 mm to 106.7 mm from the seedling to tasseling stage, and decreased the temperature by 1.1°C to 3.7°C from flowering to maturity. The concentrations of soil organic carbon (SOC), soil total and available nitrogen, phosphorus and potassium (TN, TP, TK and AN, AP, AK) were also remarkable increased by 5.9 to 55.1 (P < 0.05) for FMRFS, respectively. FMRFS considerably mitigated the effects of the frequent water and heat stress and fertility deficit and led to a higher maize yield (27.0 to 40.0), improved WUE (1.4-folds to 2.0-folds). The W200 , SOC, TN, TP, AN and AP significant contribute to maize yield. Therefore, FMRFS not only enhanced the soil fertility but also maintained soil water balance, thus causing a significant increase in maize yield and WUE.