The Change of Total Volume of Effective Composition In Organic Fertilizer of China from 1980 to 1991

图表对象 The Change of Total Volume of Effective Composition In Organic Fertilizer of China from 1980 to 1991

Source: Institute of Agricultural natural Resources and Zoning, Academy  of Agricultural  Sciences of China,1995， China cultivated land,China Agricultural Sci-tech Publishing House，p95.