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通过对不同肥力土壤样品的测试分析、吸附实验及盆栽试验，得到不同土壤的磷含量及相对于最佳处理（ＯＰＴ）的百分产量。并利用这两项指标，应用模糊聚类分析的方法，求出河南土壤盆栽试验磷的亏缺临界值为１６．２μｇ／ｍｌ。
Through the analysis of soil samples with different fertility, adsorption experiments and pot experiments, the phosphorus content of different soils and the percent yield relative to OPT were obtained. And using these two indicators, the fuzzy clustering analysis method was used to find the critical value of phosphorous deficient in soil pot experiment in Henan was 16.2μg / ml.