The regional differentiation of heavy metals were as follows:The soilutilization in east and west mountain soils on Fen River basin showed no difference;
地域差异研究表明：东西两山山地土壤多数元素含量差异不显著，利用较为一致。
2
Multiple cropping vegetable and rice can improve soilutilization rate reduce plant diseases and insect pests and prevent soil stalinization in protective field.
稻菜复种可以提高土地利用率、少蔬菜的病虫害、止保护地内土壤的盐渍化。
3
Multiple cropping vegetable and rice can improve soilutilization rate, reduce plant diseases and insect pests and prevent soil Stalinization in protective field.