Effects of Supplemental Irrigation and Nitrogen Application on Dry Matter Accumulation and Yield of All-film Double-furrow Sowing Maize in the Semi-arid

Field trials were conducted to study supplemental irrigation and nitrogen application on dry matter accumulation and yield of all-film double-furrow sowing maize.The results showed that the dry matter accumulation of whole plant and straw in corn growth period appeared as S shaped curve.With the increasing of growth period corn whole-plant dry matter increased.At the same PK fertilizer level,the accumulation of straw dry matter showed an increasing trend with the additional amount of N;Under supplementary irrigation(50 mm) and same fertilization condition,corn yield and agronomic efficiency of N fertilizer increased by 4% to 21% and 1.8% to 20% respectively than that of no irrigation condition;Under the condition of application of N(225 kg/hm2),P2O5(120 kg/hm2),K2O(60 kg/hm2) and supplementary irrigation(treatment W1N4) corn yield was the highest(10971 kg/hm2),which was significantly higher than that of other treatments.This research indicated that balanced fertilization and supplementary irrigation could significantly increase corn grain yield under the condition of all-film double-furrow sowing.