This method is identical to Method 9I2c in all respects, except for the final calculation, which uses Olsen-P (and an adjustment factor of 4.59 × Olsen-P; units of mg P/kg) in place of Colwell-P as the measure of current soil P fertility. The calculation (and Note 1) of Method 9I3a applies.
Report PBI+OlsenP on an air-dry (40°C) basis.