氮肥后移对不同类型小麦品种生长及产量的影响

目的]研究不同小麦品种适宜的追肥时期是否存在差异。方法]选用3个具有代表性的小麦品种(济麦22、临麦4号、LN66),研究氮肥不同追肥时期对小麦分蘖动态及产量构成要素的影响。结果]适时将小麦的追肥时期后移,可以提高小麦产量。不同小麦品种适宜的追肥时期存在差异。对于大多数小麦品种(如济麦22和临麦4号),氮肥的适宜追肥时期为拔节期;对于生长后期有早衰迹象的小麦品种(如LN66),开花期追肥较为适宜。结论]在小麦生产过程中应根据小麦的品种特性适期追肥。

Effect of Postponing N Application on the Growth and Yield of Different Types of Wheat Varieties

Objective] The aim was to study whether there are differences in topdressing period of different wheat varieties. Method] Selec-ting 3 representative wheat varieties(Jimai 22, Linmai 4, LN66), effects of different N topdressing period on wheat tiller dynamics and yield components were studied. Result] Appropriately postponing N top-dressing time could improve the yield of wheat.Different types of wheat varieties appropriate N top-dressing time were different.To most of wheat varieties(such as Jimai 22 and Linmai 4), the suitable N top-dress-ing time was the jointing stage, but to the senescence of wheat varieties(such as LN66), the suitable N topdressing time is the flowering stage. Conclusion] We must choose the appropriate nitrogen top-dressing time according to the characteristics of wheat varieties.