Parameters | Methods |
pH | pH meter with soil/water ratio 1/2.5 |
Granulometry or particle size | Bouyoucos method |
Carbon | Method of Walkley and Black (1934) |
Nitrogen | Kjeldahl method |
Phosphorus | Bray’s method I |
Cation exchange capacity (CEC), | Ammonium acetate method pH = 7 |
Exchangeable bases | Automatic extraction method |
Exchange acidity and aluminum | Method by automatic extractor and titration with sodium hydroxide |
ETM | Dissolution and reading by Atomic Absorption Spectrophotometer |