钾对棉株体内NPK养分含量变化的影响

Effect of Potassium on N P K the Nutrient Content of Cotton

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。

From 1990~ 1993, based on the studies that effects of utility of potassium fertilizer in the Huanghuaihai cotton growing region, The authors have further studied the effects of potassium on the stem leaves, its change of N, P, K nutrient content at different growing stages, and the effects of different potassium rate applied on the nutrient content to the different cotton plant parts. It indicated that application of potassium could regulate the nutrient content of the cotton stem leaves, improve transpotation of the nutrient, increase ratio of K/N in the cotton plants, and explained the changes of the nutrient content in different cotton plant positions. The more N, K content changed, the less P content changed relatively; The measuremnt on July 8 and Sep. 8 of the nutrient content in the roots and stems showed. The first one was K, second N, third P; but leaves and the bell shells contained most N, less relatively K.