苏北湖相沉积物土壤,系指江苏省里下河地区发育于近代湖积物上、沼泽起源的水稻土[1],主要分布在江苏省兴化县和射阳湖沿岸,过去多为一熟“沤田”(一年种植一季极早熟水稻)属于低产土壤之一。据1953年统计,全区“沤田”面积约524万亩,其中兴化县为150万亩,占该县耕地面积的66.5%,粮食单产徘徊 The sediment soil in the northern Jiangsu province refers to the paddy soil developed in the Lixiahe area of ​​Jiangsu Province on the modern lakes and marshes and the marsh origin [1], mainly distributed along the coasts of Xinghua County and Sheyang Lake in Jiangsu Province, mostly in the past A cooked “沤 Tian” (one year planted very early season paddy) is one of the low-yielding soil. According to statistics in 1953, the area covers an area of ​​about 5,440,000 hectares, of which 1.5 million hectares are in Xinghua County, accounting for 66.5% of the cultivated land in the county. The yield of grain hovers