小麦、玉米、水稻施肥模型的建立

采用系统研究法在河北省玉田县进行施肥推荐的田间试验和示范,根据19921993年的试验和示范结果,建立包括土壤测试值、施肥量和若干虚似变量为自变量的小麦、玉米、水稻施肥模型,编写了在EXCAL软件上的应用程序,为模型的应用创造了条件。

MODELING OF FERTILIZER APPLACATION ON WHEAT, MAIZE AND RICE

Based on the results of laboratory soil testing, greenhouse studies, field experiments and demoastration plots in 1992-1993 in Yutain, Hebei province, which were designed by using the systematic approach, models for fertilizer recommendation for wheat, maize and rice were established. The yariables in the models include soil testing values, fertilization rates, adsorption coefficients and several dummy variables, such as year and location. By using these models, a EXCAL software programs were developed to give fertilizer recommendations for wheat, maize and rice for maximum ecomic return.