摘要
应用二次饱和D-最优设计研究了宁夏南部山区旱地冬小麦氮磷肥的合理施用量．结果表明,宁夏南部山区旱地施肥量严重不足,化肥增产潜力巨大．在春旱严重的情况下,磷肥的增产作用大于氮肥,氮磷肥配合施用增产效果更加显著,比不施肥时增产1410kg/hm2,比习惯种植增产810 kg/hm2,增产率为46．4％．最佳产量为2 490 kg/hm2时,施氮量为 93．6 kg/hm2,施磷量(P2O5)为108．9 kg/hm2,产投比为3．4:1,效益显著．
The optimized designing of N, P was adopted to study the optimized amounts of N, P to winter wheat. The results indicated that the amounts of applied fertilizers in southern Ningxia were serious insufficient. Applied fertilizers have huge latent for increasing the yield of wheat. In the dry years, phosphorus fertilizer takes higher effect than Nitrogen fertilizer. N and P matching can increase the yield 1 410 kg/hm^2 compared with CK, and 810 kg/hm^2 compared with the usual cultivation. The rate of growth was 46. 4 %. The optimum application of pure N should be 93. 6 kg/hm^2, and P2O5 should be 108. 9 kg/hm^2. The optimum yield of wheat was 2 490 kg/hm^2. The rate of production and investment was 3. 4 to 1. That achieved notable benefit.
出处
《宁夏大学学报（自然科学版）》
CAS
北大核心
2005年第4期373-375,共3页
Journal of Ningxia University(Natural Science Edition)
基金
国家自然科学基金资助项目(40161005)
关键词
冬小麦
氮磷肥效
施肥量
宁夏南部山区旱地
winter wheat
effect of N and P
amounts of fertilization
rainfed land in the southern Ningxia
