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1984～1993年，以玉米、水稻为供试作物，设置经典的5处理肥料田间试验。结果表明，沈阳市两大主栽作物产量对土壤肥力的依存率为52．6％，余者为肥料效应。土壤氮磷钾养分的保证程度分别为63．6％，83．6％和85．5％。通过基础产量与施肥最高产量回归统计，获得以y＝100x／（a＋bX）为模型的两个“以地定产”算式；用基础产量与土壤有效养分含量回归统计，获得土镶有效养分校正系数，就此可算出土壤某种养分供应量，为推行配方施肥技术提供了准确的参数。
From 1984 to 1993, corn and rice were used as the experimental crops, and a classic 5-treatment fertilizer field experiment was set up. The results showed that the yield of two main crops in Shenyang was 52.6% of the soil fertility, the rest being fertilizer effect. Soil nitrogen, phosphorus and potassium nutrient assurance degree were 63.6%, 83.6% and 85.5%. Through the regression analysis of the basic yield and the maximum yield of fertilization, two “yielding” formulas were obtained with y = 100x / (a + bX) as the model. The regression equation between yield and soil available nutrient content was used to obtain the effective nutrient correction coefficient , This can be calculated soil nutrient supply for the implementation of formula fertilizer technology provides an accurate parameter.