黄淮海平原盐碱地约5000万亩左右,集中分布在滨海地区和豫、鲁、苏、皖四省古黄河背河洼地两侧。盐碱地由于含可溶性盐分较多,土壤瘠薄,施肥量又少,形成了土壤“碱、湿、凉、板、薄”特点,影响棉花的正常发育,限制棉花产量的提高。我们从1975年开始连续14年在河南省商丘县开展黄 Huanghuaihai plain about 50 million mu of saline land, concentrated in the coastal areas and Henan, Shandong, Jiangsu and Anhui provinces in the Yellow River backwaters depression on both sides. Salt-alkali soil contains more soluble salt, infertile soil and less fertilizers, forming the characteristics of soil “alkali, wet, cool, plate and thin”, affecting the normal development of cotton and limiting the increase of cotton yield. We have been developing yellow in Shangqiu County, Henan Province for 14 consecutive years since 1975