Comparison of potassium absorption and utilization for different cotton varieties

Potassium absorption and utilization for different cotton varieties were studied based on the screening experiment of seedling stage.The varieties are potassium-efficiency genotypes,Xinluzao 6,Xinluzhong 15,and Xinhai 16, and potassium-inefficiency genotypes,Xinluzao 10 and Shi K7.The results show that there are significant differences between potassium content,potassium accumulation and biomass yield of the different cotton genotypes under the two potassium conditions.The Xinluzhong 15 is the best genotype in potassium content,potassium accumulation and biomass yield without potassium application.The qualities of potassium content,potassium accumulation and biomass yield are 1.17 times,1.47 times and 1.25 times of those of Shi K7.Values of the potassium utilization index are different in different cotton genotypes especially under the condition of potassium application.The potassium utilization index of Xinluzhong 15 under the condition of potassium application is 1.40 times,1.31 times and 1.34 times of that of Shi K7 in 80 d,120 d and 140 d.