重庆市坡瘠地玉米高产模型研究

采用回归最优设计４１６Ｂ方案，研究了氮、磷、有机肥和密度对玉米的效应，结果表明，按选出的５种高产栽培方案，玉米产量可提高２倍，在施一定磷和有机肥的基础上，增加氮量利于叶面积的扩大，有助于提高玉米产量；在一定氮和有机肥水平上，叶片中磷含量和土壤有效磷的含量密切相关，Ｒ＝０．６８７＞Ｒ０．０１（１．１４）＝０．２３。

A MODEL FOR HIGH MAIZE YIELDS IN IMPOVERISHED SOIL

The 416B regression method was adopted in studying the effects of nitrogen,phosphorus,organic fertilizer and density on the yield of maize. The optimized regressionequation was established wliereby five culture ry1ethods for obtaining high yield weredeveloped.The results show that these methods can double maize yields. It was alsodiscovered that on the base of certain phosphorus and organic fertilizer,the leaves growwith the increasc of nitrogen applicaton,which contributes to the maize yields,while on thebase of certain nitrogen and organic fertilizer,the phosphorus content in the leaves relatesclosely with effective phosphorus content in soil.The correlation cofficient R is 0. 687>R_(0.01)=0.23