Characteristics of ferrous iron forms in paddy soil with reference to development of the soil profile

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Abstract
It is considered that transformation of iron compounds owing to alternation of submergence and drainage exert a complicated influence on physico-chemical properties of paddy soils and that subsequent changes in physicochemical properties play an important role in the development of paddy soil profile, for example gley formation, occurrence of iron mottling etc. Ferrous iron in waterlogged condition, however, exists in many complex forms, and is under physico-chemical equilibrium in conjunction with the environmental soil condition. In the previous paper, the authors have suggested that ferrous iron status in submerged condition is closely related to the characteristics of genetic soil types from their experiment on fractionation of inorganic ferrous iron (8).