Accepted and revised in L95-105. Five-point sampling method was used in both fields (0-20cm). A total of 5 topsoil samples in each field were taken using a stainless steel spade and mixed thoroughly. Afterwards the soil samples were chosen by quartation; Then plants’ debris and residues were removed. Finally soil samples were 0.3-mm sieved and stored in brown glass bottles at 4 °C. The following was the area that the Florida soil was collected.
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