白善土、红黄土、黄泥土、马干土、砂土、乌沙土是我县水稻地区栽培水稻、小麦、油菜、绿肥等作物的主要农业土壤。面积约40万亩,占全县总耕地面积(60万亩)的66.6％。这些土壤大都呈微酸性反应(PH5.6—6.2),有机质不足,鉄铝含量高,土壤肥力低,磷素营养。特别是有效磷缺乏,故作物生长不良,产量低劣。因此,如何提高这些土壤的肥力,是迅速增加我县粮、棉、油等主要作物总产量的有效措施。自1961年以来,我们在这些 White sandy soil, red loess, yellow soil, horse dry soil, sand, wusha soil is my county rice cultivation of rice, wheat, rape, green manure and other crops of the main agricultural soil. An area of ​​about 40 acres, accounting for 66.6% of the total cultivated area (60 acres). Most of these soils are slightly acidic (pH 5.6-6.2), with insufficient organic matter, high aluminum content, low soil fertility and phosphorus nutrition. In particular, phosphorus deficiency, poor crop growth, poor production. Therefore, how to increase the fertility of these soils is an effective measure to rapidly increase the total output of main crops such as grain, cotton and oil in our county. We have been here since 1961