The presence of acid sulphate soils (ASS) in the upper Chicamocha river basin (Boyaca, Co- lombia) is due to iron and sulphur oxide-reduction processes being located there, influencing the ex- treme acidification and modification of the area's physicochemical characteristics. This research was aimed at establishing parameters through observing the behaviour of Eh (mV), pH (1:1, soil-water), pHox (1:1, soil- peroxide hydrogen 30%) and Al +3 . These parameters indicate severe ASS degradation and its relationship to the presence of organic materials or minerals constituting diagnostic sulphuric horizons. Most sulphuric horizons agree with positive Eh (mV) >400; pH 5 cmol· kg -1 . These indica- tors illustrated the heavy oxidation and limitations on agricultural productivity regarding ASS in the upper Chicamocha basin irrigation area.