3 The effective soil CEC is calculated by adding the sum of the base cations plus the neutralizable or exchangeable acidity (Concentration of A1+3 + H+). Calculate the effective CEC of the soil in cmol/kg if the concentration of cations is 3079 lb/ac Ca 2, 397 lb/acre Mg 2,350 lb/acre K, and the neutralizable acidity is 2.0 meq/100g. (Rule of thumb: ppm x 2 = lb/acre) 3 The effective soil CEC is calculated by adding the sum of the base cations plus the neutralizable or exchangeable acidity (Concentration of A1+3 + H+). Calculate the effective CEC of the soil in cmol/kg if the concentration of cations is 3079 lb/ac Ca 2, 397 lb/acre Mg 2,350 lb/acre K, and the neutralizable acidity is 2.0 meq/100g. (Rule of thumb: ppm x 2 = lb/acre)