《Table 5 Distribution characteristics of soil rapidly available potassium content in the Nandu River

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

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The average soil exchangeable magnesium in the research area is 239.9 mg/kg.The soil exchangeable magnesium content has a very wide variation range，from 0.8 to 9 403.4 mg/kg，with a very high variation coefficient of 229.0%.Only Lingao，Qiongshan and Danzhou all have an average soil exchangeable magnesium content of 120 mg/kg，and Danzhou has the highest value reaching441.6 mg/kg，while the average contents of other cities and counties are all lower than 90 mg/kg，and that of Qiongzhong is only46.4 mg/kg（Table 7），indicating that various cities and counties in the basin differ significantly in soil exchangeable magnesium content.