华北有很大一部分棉田分布在輕中度次生盐碱化地区。这种土壤在春季棉花播种时,表层土壤含盐量較高,影响棉花出苗、保苗。因而,在这类地区,如何采用正确的播前灌溉与农业措施,以降低表层含盐量,保证棉花出苗,是提高棉花产量的关键問題。 A large part of cotton fields in northern China are distributed in areas of mild to moderate secondary salinization. When this kind of soil is sown in the spring cotton, the salt content of surface soil is higher, affecting cotton emergence and seedling preservation. Therefore, in such areas, how to adopt proper pre-sowing irrigation and agricultural measures to reduce surface salinity and ensure cotton sprouting is the key issue to increase cotton yield.