精耕細作、施用有机肥料以培育肥沃土壤,是我国劳动人民的传統經驗,为了研究有机肥料影响土壤腐殖貭的变化,曾在北京郊区以种植蔬菜年限不等的土壤与旱地进行了比較研究。据初步研究結果表明,旱地改为蔬菜地,由于精耕細作和大量施用有机肥料,进行綜合的农业措施,土 Intensive cultivation and application of organic fertilizers to cultivate fertile soils are the traditional experiences of working people in our country. In order to study the effects of organic fertilizers on the changes of soil humus, soil and dry land were planted in the suburbs of Beijing in varying years. According to the results of the preliminary study, the dry land was changed to vegetable land. As a result of intensive farming and extensive application of organic fertilizers, comprehensive agricultural measures were carried out. Soil