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The Effect of Redox on the Solubility and Availability of Manganese in a Calcareous Soil
Author(s) -
Schwab A. P.,
Lindsay W. L.
Publication year - 1983
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/sssaj1983.03615995004700020008x
Subject(s) - solubility , redox , manganese , oryza sativa , calcareous , chemistry , phase (matter) , environmental chemistry , inorganic chemistry , botany , biochemistry , biology , organic chemistry , gene
Soil suspensions were maintained at various fixed redox levels to assess the effect of redox on the solubility and availability of Mn. After 4 weeks of incubation, the liquid phase of the suspensions was analyzed, and the activity of Mn 2+ was calculated. The results indicated that Mn solubility was controlled by MnCO 3 (rhodocrosite) below pe + pH = 16. Literature findings also suggest the presence of MnCO 3 when Mn 2+ activities were calculated and plotted as a function of redox. When rice plants ( Oryza sativa ) were grown in the controlled redox suspensions, the uptake of Mn by rice plants was highly correlated with the activity of Mn 2+ in solution. The study demonstrates the usefulness of chemical equilibrium relationships to predict the solubility of Mn in the soil and its availability to plants.