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在黄淮海棉区施用钾肥效应研究的基础上，1990～1993年进一步探讨了钾对棉株不同时期主茎叶N，P，K养分含量的变化；及不同施钾水平对棉株各部位养分含量的影响。证实了施钾能调节棉株主茎叶的养分含量，并能促进棉株体内有效养分的运输，有效的提高了棉株体内的K／N比值；并阐述了不同钾肥用量棉株各部位养分含量的变化，N，K含量变化较大，P含量的变化较缓慢；7月8日取样测定，根、茎都以K含量最高，N含量次之，P含量最低，而叶部和铃壳以N含量最高，K含量次之。
Based on the study of potassium fertilizer application in Huang-Huai sponge area, the changes of N, P and K nutrient contents in main stems of cotton at different periods were further studied from 1990 to 1993. The effects of different K fertilizers on the nutrient contents Effect of content. It was confirmed that potassium application can regulate the nutrient content of the main stem and leaves of cotton plants and promote the transport of effective nutrients in cotton plants and effectively increase the K / N ratio in cotton plants. The nutrient contents of different parts of cotton plants The content of N and K changed a lot and the content of P changed slowly. On July 8th, the content of K was the highest, the content of N was the second, the content of P was the lowest, N content is highest, K content is second.