高水肥土壤小麦前氮后移对其生育及产量构成因素的影响

Effect of N Application at late Growth Stage on Wheat Development and Yield Composition on High Fertility Soil

连续３年多点试验表明，在土壤基础肥力较高的条件下，适当减少拔节以前的氮肥用量，一般不会影响成穗数；在雌雄蕊分化至药隔期追施氮肥并配合浇水，不仅不会加重倒伏和青干，而且可以显著改善群体质量，提高分蘖成穗率，成穗整齐，不贪青晚熟，穗粒重和产量显著提高。

The experiments in more siles in 1991～1994 showed that,under the higher fertility soil,reducing properly the applying amount of N fertilizer before jointing stage couldn't effect ear number.Top applieation of N fertilizer combined with irrigation from mid late jointing to heading stage decreased the lodging and wilting degree,improve the plant population structure obviously,increase the grain weight per ear and yield significantly.