* The factors in this table are derived from this formula:
FACTOR = [(target pH - current pH) ÷ (6.6 - current pH)].
The lime requirement (LR) in U.S. tons per acre = (acidity × FACTOR) - residual credit.
Residual credit = 8% per month for MIN soils and 16% per month for M-O and ORG soils.
Example: If soil pH = 5.0; desired pH = 6.0; acidity = 1.2; and residual credit = 0,
then LR = (1.2 × 0.625) - 0 = 0.76 ton/acre.
Acidity is calculated from the formula: (6.6 - BpH) × 4 = meq Ac/100 cm³, where BpH = the buffer pH reading determined in the lab.