Exchangecal calcium content of different soil types. The content of soil exchange calcium is closely related to soil type. Among the two main soil species in Weihai agricultural land, the average content of brown soil is higher, 1171.67mg/kg, the variation is 145.6 to 3772.8mg/kg, the standard deviation is 448.03mg/kg, and the coefficient of variation is 38 24%; low tide soil, average content of 1149.31 mg/kg, variation of 114.5 to 2940.2mg/kg, standard deviation of 427.64 mg/kg, coefficient of variation 38.08%. Exchangecalcium content brown soil and tide soil. The difference of the sub-class exchange calcium content of brown soil is small, the palm soil soil content is the highest, the average 1194.57mg/kg
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