The effect of air-drying on the level of extractable manganese and cobalt in the soil


The work presented here, was carried out to study' mainly one side of the problem, namely the slow reduction of manganese oxides by the organic matter during the process of air-drying. The other possibility - colloidal effect - needs further investigation. The effect of air-drying was studied In two alkaline soils and four acidic soils, limed to different pH. From the consideration of these results, the following conclusions can he drawn. (1) The effect of air-drying on the extractable manganese is seen only in soils with pH less than 6. (2) The effect is dependent on the amount of active manganese oxides and the amount of organic matter. (3) The, kind of organic matter and the nature of the oxide contribute to the effect of drying (but some further work is necessary.). Cobalt was included to check these factors with the assumption that it will behave as an unoxidized model for Mn. In general, there is no increase in the level of extractable cobalt after drying. Introduction of cobalt raised some new problems and an attempt was made to get some Information on the various aspects of the chemistry of, cobalt In the soil

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Last time updated on January 6, 2019

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