Studies on the lint percentage in cotton seed : II. On the variation of the lint percentage in relation to culture conditions and environments

Abstract

In the preceding paper, it was reported that in cotton the varietal difference in the lint percentage was very conspicuous. The present paper deals with the lint percentage variation in relation to the culture conditions and natural environments. It was found that the variation of the lint percentage attributable to the differences of culture conditions in the same fields was not so large compared with those due to the plant varieties or to the natural envirbnments, for, in the former case the seed weight and the lint weight increased or decreased at a similar rate. But remarkable lateness of planting time, excessive width of spacing or deficiency of potassium fertilizers, made the lint percentage somewhat lower, for, in such cases, the decreasing proportion of the lint weight was larger than that of the seed weight. The difference of the natural environments, especially that of the fields where the plants grow, brought a remarkably larger difference in the lint percentage than that due to different culture conditions in the same fields.