Navy Bean Response to Residual Effects of Soil Fertilization with Synthetic Zinc Chelates
- J.M. Alvarez *,
- P. Almendros and
- A. Obrador
The aim of this study was to determine the residual effects of Zn applied from five synthetic commercial chelates (Zn–ethylenediaminetetraacetate [EDTA]–hydroxyethyl-ethylenediaminetriacetate [HEDTA], Zn–HEDTA, Zn– diethylenetriaminepentaacetate [DTPA]–HEDTA–EDTA [Zn-D-H-E], Zn–EDTA, and Zn–ehtylenediaminedihydroxysulfophenylacetate [EDDHSA]) to two soils: Soil 1 (weakly acidic, with moderate permeability) and Soil 2 (calcareous, with moderate to rapid permeability), in a greenhouse experiment. Beneficial effects of Zn on navy bean (Phaseolus vulgaris L.) response (dry matter yield, total and soluble Zn concentration, and the utilization of applied Zn) were observed, with significant increases in all of the determined plant parameters, especially in Soil 1, in comparison with the control (no Zn addition). The rates of increase varied among sources depending on the soil. For Soil 1, the greatest increases were usually observed for the Zn–HEDTA fertilizer, while for Soil 2 the greatest increases were exhibited for the Zn-D-H-E and Zn–EDTA sources. The fertilizers that produced the biggest total Zn leaching losses were the three sources that contained EDTA and DTPA, especially in the case of Soil 2. The amounts of easily leachable Zn (estimated using the dilute BaCl2 extraction) were significantly correlated with the amounts of Zn actually leached. The amounts of potentially available Zn and Zn in the water-soluble-plus-exchangeable fraction (as assessed by single and sequential extractions) generally decreased in the second cropping year; this could have been due mainly to Zn leaching and to aging processes, especially in Soil 2.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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