Behaviour of iron and manganese chelates in calcareous soils and their effectiveness for plants |
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Authors: | R Boxma A J de Groot |
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Institution: | (1) Institute for Soil Fertility, Haren-Groningen, The Netherlands |
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Abstract: | Summary The behaviour of the metal chelates Mn-EDTA, Mn-DTPA, Mn-EDDHA, Fe-EDTA, Fe-DTPA and Fe-EDDHA in calcareous soils and their
availability to plants were studied.
The effectiveness of a metal chelate was shown to depend on its stability, the fixation capacity in the soil and its toxicity
to the plant. Incorporation of Fe-DTPA into a framework of silica molecules prevents the fixation of Fe-DTPA in the soil.
Fe-DTPA and Fe-EDDHA cause a reduction in the manganese uptake of the plant.
The most striking result was the behaviour of Mn-DTPA in calcareous soils. Partial replacement of manganese in the chelate
by iron from the soil makes this chelate useful for supplying the plant with both iron and manganese. Mn-DTPA appears to be
the ideal type of chelate for the correction of chlorosis in the Netherlands, but unfortunately is not yet commercially available. |
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