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山西省介休市耕地通过1983年土壤普查，土壤养分状况是少氮、缺磷、钾有余，这个科学依据为指导合理施肥起到一定作用。但是，随着农业生产水平的提高，农业投入氮、磷化肥激增，而一向靠土壤供给的钾素增加缓慢，入不敷出。试验结果表明增施钾肥一般增产13％~17％，增施钾肥成为当前保持土地肥力作物持续增产急待解决的问题。
Shanxi Province, Jiexiu Cultivated land passed the 1983 soil survey, soil nutrient status is less nitrogen, phosphorus deficiency, potassium more than this scientific basis for the guidance of rational fertilization play a role. However, with the improvement of agricultural production, the input of nitrogen and phosphate fertilizer into agriculture has soared, and the supply of potassium, which has always been supplied by the soil, has been slow to increase beyond its means. The test results show that the general increase of potassium fertilizer by 13% to 17%, increasing the application of potassium fertilizer has become the current sustained land fertility crops continue to increase the urgent problem to be solved.