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Manganese and Iron Solubility Changes as a Factor in Tile Drain Clogging: II. Observations During the Growth of Cotton
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/sssaj1973.03615995003700010011x
Subject(s) - manganese , solubility , chemistry , dissolution , irrigation , nitrate , environmental chemistry , agronomy , organic chemistry , biology
Various levels of oxidation‐reduction develop in the soil profile during the irrigation and growing season of the cotton ( Gossypium hirsutum L.) crop. Reducing intensity increased with depth during the growing season and reached maximum intensity at the 6.10‐m depth. Reducing conditions favorable to increased solubility of Fe and Mn were observed in the surface horizons of the profile during most of the season. Changes in the solubility of manganese and iron occurred with changes in the oxidation‐reduction status in the soil profile. Manganese began to dissolve at 400 mV and became significant at less than 300 mV. Increased concentration of nitrate retarded reduction of oxidized Fe and Mn compounds. The salinity of the soil solution affected the concentration of soluble manganese and iron. The presence of NO 3 ‐ ‐N in the soil solution in amounts >0.2 ppm retarded the dissolution of Mn compounds. The solubility of manganese and iron can probably be controlled by controlling or regulating the oxidation‐reduction status of the soil profile by reducing the waterlogging period after irrigation to a minimum.