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棉种产量和质量是由单位面积霜前铃数、铃成熟种子数、粒重三个因素构成的。霜前铃数取决于最佳结铃期结铃率的高低,铃成熟种子数和粒重则决定于最佳部位成铃
Cotton yield and quality is determined by the number of bell frost per unit area, bell mature seeds, grain weight of three factors. The number of frosts before frost depends on the optimum period of bolls, the number of mature seeds and grain weights are determined by the best part of the boll