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我国的有机质和腐殖质资源已大面积减少,特别是在水蚀和风蚀严重的地区。从以下资料可以看出改善土壤腐殖质状况的复杂性;我国每年平均施入每公顷的有机质只有4吨左
Our organic and humus resources have been greatly reduced, especially in areas where water erosion and wind erosion are serious. From the following information can be seen to improve the status of soil humus complexity; average annual application of organic matter per hectare in China only 4 tons left