《Table 7 Distribution of soil exchangeable Mg in the Se-rich areas of Hainan》

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《Distribution of Soil Nutrients in Se-rich Areas of Hainan Island》

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As an essential element for crop growth and development，Mg is also essential for soil fertility in the Se-rich areas of Hainan.The average content of soil exchangeable Mg was 105.4 mg/kg in the Se-rich areas of Hainan，with the distribution ranging from 1.8 to830.4 mg/kg.The spatial variability was slightly high，and the coefficient of variation was 107.4%with the standard deviation of104.4.Its content was the highest in fluvial plains（Table 7），with a mean value of 162.6 mg/kg，and the lowest in uplands，where the average value was only 74.1 mg/kg.There were no big difference in soil exchangeable Mg content between other terrains，all within the range of 100.0-110.0 mg/kg.