Raw or Incubated Olive-Mill Wastes and Its Biotransformed Products as Agricultural Soil Amendments-Effect on Sorption-Desorption of Triazine Herbicides
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- 作者：Laura Delgado-Moreno ; Gonzalo Almendros ; Ará ; nzazu Peñ ; a
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2007
- 出版时间：February 7, 2007
- 年：2007
- 卷：55
- 期：3
- 页码：836 - 843
- 全文大小：92K
- 年卷期：v.55,no.3(February 7, 2007)
- ISSN：1520-5118
文摘
Raw olive-mill waste and soil amendments obtained from their traditional composting or vermicomposting were added, at rates equivalent to 200 Mg ha-1, to a calcareous silty clay loam soil in alaboratory test, in order to improve its fertility and physicochemical characteristics. In particular, theeffects on the sorption-desorption processes of four triazine herbicides have been examined. Wefound that comparatively hydrophobic herbicides terbuthylazine and prometryn increased their retentionon amended soil whereas the more polar herbicides simazine and cyanazine were less affected.Soil application of olive cake, without transformation, resulted in the highest herbicide retention. Itsrelatively high content in aliphatic fractions and lipids could explain the increased herbicide retentionthrough hydrophobic bonding and herbicide diffusion favored by poorly condensed macromolecularstructures. On the other hand, the condensed aromatic structure of the compost and vermicompostfrom olive cake could hinder diffusion processes, resulting in lower herbicide sorption. In fact, theprogressive humification in soil of olive-mill solid waste led to a decrease of sorption capacity, whichsuggested important changes in organic matter quality and interactions during the mineralizationprocess. When soil amended with vermicompost was incubated for different periods of time, theenhanced herbicide sorption capacity persisted for 2 months. Pesticide desorption was reduced bythe addition of fresh amendments but was enhanced during the transformation process of amendmentsin soil. Our results indicate the potential of soil amendments based on olive-mill wastes in the controlled,selective release of triazine herbicides, which varies depending on the maturity achieved by theirbiological transformation.