运用正交多项式趋势系数建立冬小麦综合肥料效应函数

运用Ｃｏｌｗｅｌｌ通过正交多项式转换建立综合效应函数的方法，对冬小麦４７个田间试验结果进行一元回归及多元逐步回归分析，发现正交多项式零次趋势系数和基础产量；氮、磷两因素一次趋势系数和土壤速效养分含量有一定的相关性，由此构造出包括土壤测试值在内的综合肥料效应函数，其推荐产量值和普通肥料效应函数计算结果接近，相关性很好；但两种方法推荐施肥量之间无相关性，本方法的推荐结果更接近实际。

APPLICATIQN OF ORTHOGONAL POLYNOMIAL TREND COEFFICIENTS IN A WINTER WHEAT INTEGRATED RECOMMENDATION FERTILIZATION SYSTEM

From the regression analysis of 47 winter wheat field N,P fertilizer experi-ments,we found there were good correlation between zero trend coefficients of orthogonalpolynomial and base yield ,also correlation between linear trend coefficients of N,P and con-centration of some soil available nutrients,so we set up the integrated recommendation fertil-ization system which included some soil N,P testing values. Yield goals of this method weresimilar to the calculated results of normal fertilizer response functions ,the yield goals of twomethods had a good correlation,the results of our method are better.