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Based on the datum of soil fertility obtained by investigation, an evolution of soil fertility in Yunlianghu Farm was analyzed. The results showed that soil Organic Matter (OM) declined continuously from 1981 to 2007, in which it reduced quickly from 1981 to 1998 and slowly from 1998 to 2007, and the rate was 1.1365 g/kg and 0.58889 g/kg per year, respectively, the content of soil available phosphorus...