棉花从出苗到现蕾,这段时间称为苗期。一般约需35～45天。早熟棉品种苗期短,中、晚熟品种苗期较长。苗期以生根,长茎、叶,增大营养体为主,也叫营养生长期。并开始花芽分化。棉花苗期,在黄淮海棉区,常遇干旱多风,低温寡照,病、虫为害;麦套棉,共生期间,遮阴重,“三争”(光、水、肥)矛盾突出,都容易造成弱苗、病菌或死苗,出现与壮苗早发的矛盾。因此,棉花苗期管理措施,应紧紧围绕克服多种自然灾害等不良因素带来的不利影响,注意改善生长发育环境,才能促进幼苗正常 Cotton from emergence to budding, this time is called seedling. Generally takes about 35 to 45 days. Precocious varieties of cotton seedling short, medium and late maturing varieties of seedling longer. Seedling to take root, long stems, leaves, increase the main nutrition, also known as vegetative growth period. And start flower bud differentiation. Cotton seedling stage, in the Huanghuai sponge area, often encounter arid wind, low temperature, photo, disease, insect damage; wheat cotton, symbiotic period, shade heavy, , Are likely to cause weak seedlings, germs or dead seedlings, seedlings appear early and contradictions. Therefore, cotton seedling management measures should focus on overcoming the adverse effects of various natural disasters and other adverse factors, pay attention to improving the growth and development environment, in order to promote the normal seedlings