开裂后的棉铃需经3到4天后,种子和纤维才能完全成熟,故棉铃从开始开裂到完全成熟一般需要6～7天。成熟的棉铃摘拾后纤维品质好、产量高。而当前大多数棉农为了怕棉花丢失,习惯于采摘“笑口棉”(刚裂口棉铃),对产量和品质都有较大影响。据试验:成熟棉铃(铃壳向外翻卷)纤维的成熟 Cracked cotton boll after 3 to 4 days after the seeds and fibers can be fully mature, so the cotton boll from the beginning to complete maturity cracking generally takes 6 to 7 days. Mature boll picking fiber quality, high yield. At present, most cotton farmers are accustomed to picking “smiles cotton” (fresh-cut cotton bolls) for fear of losing cotton, which has a great impact on yield and quality. According to the test: ripe cotton bolls (bell shell rolled out) fiber maturation