半干旱区补灌及施氮对全膜双垄沟播玉米干物质积累及产量的影响

采用田间试验的方法研究补灌及施氮对全膜双垄沟播玉米干物质积累及产量的影响.结果表明,在不同施肥方式下,玉米各生育期全株、秸秆干物质积累均呈现出“S”型曲线变化规律.玉米全株干物质量均随生育期的延长而增加.相同P、K肥条件下,增施N肥可增加玉米秸秆干物质量；补灌(50 mm)条件下,相同施肥处理玉米产量和N肥农学效率分别比无灌溉增加4％～21％、1.8％～20％；补灌条件下,N、P2O5和K2O的用量分别为225、120、60 kg/hm2时(Wl N4处理),玉米产量最高,可达到10 971 kg/hm2,明显高于其他处理.表明玉米在全膜双垄沟播栽培技术条件下,平衡施肥和补灌可显著增加玉米籽粒产量.

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.