Descriptive statistics for selected soil trace elements in the study agricultural field of northeast China.
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†Min, Max and CV are abbreviations for minimum, maximum and coefficient of variation.‡Critical levels for available Fe, Mn, Cu and Zn recommended by Liu [29] are 4.5 mg•kg−1, 100 mg•kg−1, 0.3 mg•kg−1 and 1.0 mg•kg−1 (DTPA extracted). The concentrations of available Fe, Mn, Cu and Zn under the critical levels are recognized as deficiencies.
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2015-12-02
