关键词: 春季低温, 春季低温, 水稻育秧, 危害, 南郑

Abstract: Lint yield was composed of three important factors of the number of cotton bolls per 667m2, boll weight and ginning outturn. According to 2002-2004 year Henna area experiment and production experiment results of Baimian 2, The statistics yield components in Baimian 2 were carried out, The contribution of the number of cotton bolls per 667 m2 is biggest among all the yield components, the contribution of ginning outturn is less than that of the number of cotton bolls per 667m2, The contribution of the weight per cotton boll is least. The analysis of partial correlation showed that there were two negative correlation between the number of cotton bolls per 667 m2 and boll weight and ginning outturn. among the two negative correlation, the coefficient of partial correlation r13.2y=-0.8196** was extreme significance. In environment factor cultivated practice, The high yield can be attained by high numbers of cotton bolls per plant, high ginning outturn and stable weight of cotton bolls and optimum density, the optimum density is 8.25×104–9.0×104 plants/hm2.