《Table 5 Distribution of soil Available K in the Se-rich areas of Hainan Province》

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

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The average content of soil available K in the Se-rich areas of Hainan was 58.0 mk/kg，which was at the level of deficiency.The variation range was from 6.0 to 444.0 mk/kg，the variation coefficient was 101.2%，and the standard deviation was 58.6.The soil available K content was also affected by different terrains（Table 5）.The available soil K content was the highest in the plain area，where the average content of soil available K was 69.6mg/kg，and was the lowest in the upland area，which had a mean value of 42.0 mk/kg.The soil available K content showed great spatial variability in the platform，which had a variation coefficient of 139.6%and standard deviation of 90.4.