Hydric soils have formed under conditions of saturation, flooding or ponding long enough during the growing season to develop anaerobic conditions. Reduced soil materials have a gleyic colour, bluish to greenish and Gr is present in the first 50 cm in the upper part of soil. Oximorphic properties apply to soil materials at surface layers of soils with fluctuating ground water level, marked  by reddish brown, orange or yellowish mottles.

Gleysols; oxidation; reduction; potential; redox

Presentation: oral