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