棉花从出苗到现蕾这段时期称为苗期。棉花苗期吸收能力较弱,氮、磷、钾利用比例仅依次为全生育期的10％、5.8％和2.1％左右。但棉花苗期追肥对促进根系伸展、早发真叶、健壮生长、增强抵抗力和减少死苗有显著作用。棉花苗期施肥方法是:子叶期 Cotton from budding to budding during this period known as the seedling. Cotton seedling absorption capacity is weak, the proportion of nitrogen, phosphorus and potassium use of the whole growth period followed by only 10%, 5.8% and 2.1%. However, cotton seedling topdressing to promote root elongation, early leaf true, robust growth, increased resistance and reduce dead seedlings have a significant role. Cotton seedling fertilization method is: cotyledons