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Effect of Zinc Source Applied to Soils on its Availability to Navy Bean

Departamento de Química y Análisis Agrícola, E.T.S.I. Agrónomos, Universidad Politécnica de Madrid (UPM), Ciudad Universitaria s/n, 28040 Madrid, Spain

View larger version (26K): [in this window] [in a new window]   Fig. 1. Amounts and concentrations of Zn in 10 leachate portions vs. volume of leachate from soils amended with 0 (control), 5, and 10 mg Zn kg–1 soil as Zn–diethylenetriamine-pentaacetate–N-2-hydroxyethyl-ethylenediamine-triacetate–ethylenediamine-tetraacetate (Zn–DTPA–HEDTA–EDTA or Zn-D-H-E). The vertical line at each of the data points represents standard error of the mean.

View larger version (41K): [in this window] [in a new window]   Fig. 2. Zinc fractions in soils at the moment of navy bean harvest with 0 (control), 5, and 10 mg Zn kg–1 soil as Zn–diethylenetriamine-pentaacetate–N-2-hydroxyethyl-ethylenediamine-triacetate–ethylenediamine-tetraacetate (Zn–DTPA–HEDTA–EDTA or Zn-D-H-E) and Zn–aminelignosulfonate (Zn-AML). Zinc fractions are residual fraction (RES), crystalline Fe oxide bound (CFeO), amorphous minerals colloids bound (AMC), organically bound (OM), easily reducible metal oxide bound (RMO), organically complexed (OC), and water soluble plus exchangeable (WSEX).