Graduate Thesis Or Dissertation
 

The effect of selected potassium salts on the availability of soil manganese

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  • Incubation experiments with an acid poorly drained soil have shown that the application of neutral soluble salts influenced the level of extractable Mn. The application of a salt which lowered the soil pH either increased the extractable Mn or retarded the oxidation and/or fixation of extractable Mn. This effect was independent of the applied salt, although salts which had the greatest effect on soil pH generally had the largest effect on extractable Mn. Comparisons of K₂SO₄ with KNO₃ at equivalent concentrations of K and with K₂SO₄ at different ionic strengths showed a small but nonsignificant effect of ionic strength on the level of extractable Mn. This indicated that the solubility of the Mn oxides was largely pH dependent and that ionic strength considerations were of secondary importance. The effect of the C1 salt was over and above that of the general salt effect. The application of KC1 always released more extractable Mn than either the KNO₃ or the K₂SO₄ treatment. This was not a strict pH effect since the KNO₃ and KC1 treatments always had the same effect on soil pH. It was also not an ionic strength effect since the relative ionic strength of the K₂SO₄ treatment was 1.5 times greater than that of the KC1 treatment, and biological activity was not a factor in well aerated conditions. To explain the C1 effect, a hypothesis has been presented in which C1 would function in an oxidation-reduction reaction. In these reactions, C1 could act either as the electron donor or as an electron bridge between the reductant and oxidant. Evidence that would support this hypothesis was: 1. The similarity between the effect of KC1 and KBr on extractable Mn, i,e., the KBr treatment released more extractable Mn than the KC1 according to theory. 2, Theoretical considerations of some of the conditions which were possible in the soil system showed that both C1 and Br had the potential to reduce the lower Mn oxides under those conditions. 3. The pH dependence of the C1 effect.
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