Modificarea mobilitatii unor elemente cu rol in nutritia plantelor sub influenta variatiei potentialului redox al solului.
1994
Stefanescu D.
The main objective of this study was to determine relationships between redox potential and mobility of some soil nutrients (P, Fe, Mn, Cu, Zn). The experiment was carried out on chernozem, and the redox potential was modified by increasing soil moisture content and addition of organic matter. The results revealed that under reduced conditions, the P mobility (measured by parameters I - intensity, Q - quantity, k - rate of desorption and QK) in soil was low. This fact was attributed to pH changes and/or re-adsorption by Fe2+ - Fe3+ compounds formed during reduction. Excheangeable Fe and Mn increased with the decrease of the redox potential. Mobility of Zn and Cu can be decreased as a result of reduced conditions because of possible precipitation. They are not directly involved in soil oxidation-reduction reactions but their mobility is affected by poor aeration and through chelated Zn and Cu with organic matter of soil.
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