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１９９０～１９９２年在山西榆次市对黄土高原旱地春谷吸肥与土壤耕层供肥规律进行了研究。结果表明，土壤耕层氮磷供给能力动态变化遵循倒Ｌｏｇｉｓｔ１０生长曲线方程变化，钾的供给能力动态变化遵循一次方程变化；谷子不同生育时期吸收氮磷钾动态变化遵循Ｌｏｇｉｓｔ１０生长曲线方程变化；谷子一生随着生育进程对氮磷钾的吸收量逐渐增加，土壤氮磷钾供给量则随着谷子吸收量的增加而减少，即供给能力趋于减弱，氮的吸收高峰与土壤供给高峰基本一致，磷的吸收高峰在土壤供给高峰之后，钾的吸收高峰在土壤第一供给高峰期，孕穗至抽穗阶段是谷子吸收氮磷钾的高峰期；从谷子一生来看，吸收氮磷量小于土壤供给量，钾的吸收量大于土壤供给量。通过分析并对榆次市黄土高原区旱地春谷施肥问题提出新见解，即亩产要达到２００ｋｇ以上应重视施用钾肥。
From 1990 to 1992, the author studied the fertilizer-holding law of spring paddy in the dry land of Loess Plateau and fertilizer supply in soil in Yuci City, Shanxi Province. The results showed that the dynamic changes of supply capacity of nitrogen and phosphorus in soil topsoil followed the curve of Logist10 growth curve, and the dynamic change of potassium supply abilities followed the first-order equation. The dynamic changes of N, P and K absorption in different growth stages of millet accorded with the equation of Logist10 growth curve. With the increase of N, P, K uptake, the supply of N, P and K decreased with the increase of millet uptake, that is, the supply capacity tended to decrease, and the nitrogen uptake peak was basically the same with the peak of soil supply. Phosphorus Peak in the soil after the peak supply, potassium peak in the first peak supply of soil, booting stage to heading stage is the peak of nitrogen and phosphorus absorption of millet; millet life point of view, the absorption of nitrogen and phosphorus is less than the amount of soil supply, The amount of potassium absorbed is greater than the amount of soil supplied. Through the analysis and put forward the new opinion on the fertilization problem of spring valley in dry land in Yuci Loess Plateau, that is to say, more than 200kg per mu should be paid attention to the application of potassium fertilizer.