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Manganese and Iron Solubility Changes as a Factor in Tile Drain Clogging: I. Observations During Flooding and Drying
Author(s) -
Grass L. B.,
MacKenzie A. J.,
Meek B. D.,
Spencer W. F.
Publication year - 1973
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1973.03615995003700010010x
Subject(s) - manganese , leaching (pedology) , dissolution , soil horizon , irrigation , solubility , plough , environmental chemistry , organic matter , chemistry , total organic carbon , environmental science , soil science , soil water , agronomy , organic chemistry , biology
A field study of waterlogging and subsequent drying of the soil profile has shown that under irrigation culture in Imperial Valley reducing conditions became prevalent. Reducing conditions, as indicated by declining E h values, became most favorable for dissolution of Mn and Fe near the soil surface. However, the concentrations of Mn 2+ and Fe 2+ were lowest near the surface, probably because of their leaching from this zone, and the shorter time of contact between soil solution and soil particles. The concentration of Fe 2+ and Mn 2+ were higher in the deeper horizons of the soil profile. In the plow layer, the reducing intensity increased, beginning 9 m away from the tile and reaching a maximum 18‐ to 23‐m from the tile drain. The E h levels in the soil profile declined immediately after irrigation began and rose immediately after irrigation stopped indicating the importance of atmospheric oxygen to the oxidation‐reduction status and, therefore, to the solubility of iron and manganese compounds. Soluble organic carbon apparently was not related to the concentration of Mn 2+ or Fe 2+ in the soil solution even though the decomposition of soil organic matter is important in oxidation‐reduction reactions in the soil profile.