the gradation of the soil humus content were as followings: rice and peanut rotating land was the maximum, then were vegetable land, strawberry land and rice land, grape land was the minimum;
土壤有机质含量由大到小依次为:水稻花生轮作地>蔬菜地>草莓地>水稻田>葡萄地;
it would be important to increase soil humus content to alleviate the pollution and enhance the soil self-purification.
提高土壤腐殖质含量是减轻污染危害及增强土壤自凈能力的重要措施。
deep mixing method for soft soil is ineffective while humus content is above a certain value, thus additives should be mixed into cemented soil to eliminate the influence.