keywords: CO2 method, soil types, minerals, treatment, texture, CEC, Cat-ion Exchange Capacity, O.M., OM, Organic Matter, Humus, tilth, nuturient holding capacity, N, P, K, NPK, pH, salts, SAR, sodium absorption ratio, nitrate, phosphate, potassium, calcium, magnesium, sodium, TPSL, Texas Plant and Soil Lab, acid, alkaline, sands, clay,
