Abstract:

This experiment based on the design of 4 factors and 5 level secondary orthogonal regression was to make the target function of ginned cotton yield. The results showed: density, amount of N applied, amount of K applied had the great influenced on yield of ginned cotton, in which, the influence of density was the greatest, and that of amount of K applied was the smallest. Based on the analytical results, the regression equation of the ginned-cotton total yield was formed as followed: N 293.56-332.76 kg/hm2, P2O5 141.05-172.84 kg/hm2, K2O 130.05-188.99 kg/hm2, density 26426-29382 plants/hm2. The correlation coefficient between K and boll weight was 0.518, the amount of potassium fertilizer should be valued to improve the quality of seeds in seed production. The boll number per hm2 and ginned cotton output correlation coefficient was extremely obvious, therefore, to improve the boll number per hm2 was the main way to raise the seeds yield.