Abstract
Hydromorphic soils are found around the globe and they are well distinguished from other soil classes. The nature and
severity of hydromorphism in these soils is determined by redox reactions that are highly dependant on the level and duration
of soil saturation with water. Redox potentials are good indicator of redox reactions and/or hydromorphism. However, these
redox reactions and hydromorphic conditions are directly affected by the presence or absence of various factors such as
oxygen, organic matter and micro-organisms. In this manuscript a comprehensive review is presented about the
hydromorphic soils, causes of hydromorphism, measurement of hydromorpic conditions, factors affecting the hydromorphic
conditions and how the redox reactions can play an important role in pedogenesis of hydromorphic soils.
