《Table 4 Distribution characteristics of soil available phosphorus content in the Nandu River Basin

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《Distribution of Soil Nutrients in Nandu River Catchment basin of Hainan Island》

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The average content of soil available phosphorus in soil is15.2 mg/kg.Soil available phosphorus contents are distributed in a very wide range，from 0.1 to 148.6 mg/kg，with a variation coefficient of 154.6%（Table 4）.Baisha County shows the lowest soil available phosphorus content，only of 2.1 mg/kg，which means the soil lacks phosphorus.Wenchang County has an available phosphorus content of 33.5 mg/kg，which is the highest，so the soil in Wenchang is rich in available phosphorus.Tunchang，Qiongzhong，Qiongshan and Baisha among the cities and counties all have a soil available phosphorus content lower than10 mg/kg，while Lingao，Wenchang，Dingan，Chengmai and Danzhou show a soil available phosphorus content in the range of10.6-33.5 mg/kg.