Standard operating procedure for soil available phosphorus - Mehlich I Method
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Mehlich I method is suitable for determining bioavailable P in acid soils with low cation exchange capacity; (CEC) less than 10 cmolc kg-1. The amount of P and K extracted with Mehlich-1 has been calibrated to quantify the amount of P and K fertilizer needed to maximize crop yields in various regions. This method has also been adapted for simultaneous determination of additional plant nutrients in the extract using ICP-OES.