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配方施肥是一项技术性、综合性很强的工作,小面积试验获取准确参数比较容易做到,但不同区域土壤及其耕作条件差异十分大,试验点及相应参数所能够代表的面积不明确,因而制订的施肥配方难以在大面积上推广应用,配方施肥仅能局限在定性的水平上,很多农民盲目施肥现象仍十分严重,造成了土壤养分比例失调,粮食产量徘徊不前。为探索大面积应用配方施肥的合理途径,我们于1990～1992年开展了全市性的多因素分类优化配
Formulation fertilization is a technical and comprehensive work, and it is relatively easy to obtain accurate parameters in small-area experiments. However, the differences of soil and farming conditions in different areas are very large. The area that the test points and corresponding parameters can represent is not clear, Therefore, formulating fertilization formula is difficult to popularize in a large area, formula fertilization can only be confined to the qualitative level, many farmers blindly fertilization phenomenon is still very serious, resulting in the imbalance of soil nutrients, grain output stagnated. In order to explore a reasonable way to apply large-scale formula fertilization, we carried out the city-wide multi-factor classification and optimization from 1990 to 1992