高肥地冬小麦再高产施肥问题探讨

Studies on the Fertilizers for Higher Yield of winter wheat in High productivity Field

采用均匀设计方法，研究了高肥地区土壤条件下冬小麦再高产以施肥为主的农艺措施与产量的定量关系，建立了产量与施肥、播期、播量等６个因素的回归方程，并模拟了试验取得最高产量时的相应措施量。模型分析表明，基Ｎ、基Ｐ和基Ｋ化肥对产量具有显著的负效应，拔节期追Ｎ为正效应。利用回归模型对目前小麦生产技术量值的产量效应分析表明，在高肥地力条件下，现今生产中底施Ｎ、Ｐ化肥，实质上在对产量的形成帮“倒忙”。因此，在大量施用有机肥的基础上，免施底化肥，增加追Ｎ量，“稳前攻后”成为高肥地冬小麦再高产的重要施肥技术途径。

in high productivity field, a well-distributive design was applied in the field experiment to set up the statistical model in this paper, which described the quantity relations between 6 factors(fertilizers, sowing date and density) and the yield of winter wheat in the high productivity field. The highest yield of the model was obtained by simulating the model.The model was analysed and it was clear that the base p. K. N. would have a negative effect on the yield of winter wheat in high productivity field and the topdressing N.in the jointing stagecan increase the yield. with current techniques, which were simulated in the model, the base P. N. decreased the yield of winter wheat too.The principle of raising the yield of winter wheat in high productivity field wsa to increase the quantity of topdressing N. instead of the base N. and base P..