The effect of organic and mineral fertilization on micronutrient availability in soil
2008
Herencia, Juan Francisco | Ruiz, Juan Carlos | Morillo, Esmeralda | Melero, Sebastiana | Villaverde, Jaime | Maqueda, Celia
The application of organic amendments to agricultural soils may influence metal distribution in soil fractions and, in turn, can influence the availability of micronutrients to plants. However, in the literature, there is a great lack of data on micronutrient behavior in soils fertilized with compost from vegetable residues. The study was carried out on a loam soil, a Xerofluvent, in a field experiment. Soil received composted vegetable residues or was fertilized with conventional mineral fertilizer. This study compares Cu, Zn, Mn, and Fe availability in soil after 6 years under two different fertilization methods by using diethylenetriaminepentaacetic acid and ethylenediaminetetraacetic acid solutions. The sequential extraction method (Bureau Communautaire de Référence) was used to determine the chemical forms of the micronutrients. The results indicated that the addition of compost did not cause a significant effect on the total content of the soil but resulted in an increase in all extractable micronutrients compared with soil with mineral fertilization. The Bureau Communautaire de Référence sequential extraction indicated that the oxidizable fraction was always favored by the organic amendment, except in the case of Zn, which presented the opposite trend. However, the reducible fraction showed a high increase in the case of Zn and lower in Fe. The sum of the three extracting fractions was increased by compost addition, but they were significantly lower than the total content of Cu, Zn, and Fe, which means that these elements are specially bound to the residual fraction. This fraction accounts for more than 80% of the Fe and Cu and about 70% of the Zn in both fertilized soils.
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