Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 498082
Title Evaluation of the potential impact of Cu competition on the performance of o,o-FeEDDHA in soil applications
Author(s) Schenkeveld, W.D.C.; Weng, L.P.; Reichwein, A.M.; Temminghoff, E.J.M.; Riemsdijk, W.H. van
Source European Journal of Soil Science 66 (2015)2. - ISSN 1351-0754 - p. 277 - 285.
Department(s) Sub-department of Soil Quality
Chair Soil Chemistry and Chemical Soil Quality
Publication type Refereed Article in a scientific journal
Publication year 2015

Ferric ethylene diamine-N,N'-bis(hydroxy phenyl acetic acid) (FeEDDHA)-based iron (Fe) fertilizers are commonly applied to plants grown on calcareous soils and comprise a mixture of FeEDDHA components. Upon application to the soil, the pore water concentrations of the active ingredients racemic and meso o,o-FeEDDHA show a gradual decline unrelated to plant uptake or biodegradation. In the present study, the potential of soil copper (Cu) to reduce the effectiveness of FeEDDHA-based fertilizers in calcareous soils by displacing Fe from o,o-FeEDDHA has been evaluated through modelling and experiments. Predictions with mechanistic multi-surface models show that there is a thermodynamic basis for assuming that under equilibrium conditions a certain fraction of o,o-EDDHA ligands in soil solution can be chelated to Cu, in particular for meso o,o-EDDHA. The large affinity of o,o-CuEDDHA for binding to the soil solid phase, demonstrated in a batch interaction experiment, greatly increases the potential impact of Cu competition on the o,o-FeEDDHA solution concentration; for a given quantity of o,o-CuEDDHA in soil solution, a much larger quantity of o,o-CuEDDHA is adsorbed to the solid phase. Finally, evidence for the actual displacement of Fe from o,o-FeEDDHA by Cu was found in a soil incubation study. With these results, the boundary conditions are met for explaining the observed gradual decline in o,o-FeEDDHA concentration with Cu competition.

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