Availability of triazine herbicides in aged soils amended with olive oil mill waste

Alegria Cabrera, Lucia Cox, William C. Koskinen, Michael J. Sadowsky

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

Amendments are frequently added to agricultural soils to increase organic matter content. In this study, we examined the influence of alperujo, an olive oil mill waste, on the availability of two triazine herbicides, terbuthylazine and atrazine, in two different sandy soils, one from Sevilla, Spain, and the other from Minnesota. The effect of aging on herbicide sorption and bioavailability was also studied. Soils were amended with alperujo at a rate of 3-5% (w:w) in laboratory studies. Apparent sorption coefficients for the triazine herbicides were calculated as the ratio of the concentrations of each herbicide sequentially extracted with water, followed by aqueous methanol, at each sampling time. These data showed greater sorption of terbuthylazine and atrazine in amended soils as compared to nonamended soils, and an increase in the amount of herbicide sorbed with increasing aging time in nonamended soils. The triazine-mineralizing bacterium Pseudomonas sp. strain ADP was used to characterize triazine bioavailability. Less mineralization of the herbicides by Pseudomonas sp. strain ADP was observed in soils amended with alperujo, as compared to the unamended soils, and, despite the increase in sorption with aging in unamended soils, herbicide mineralization also increased in this case. This has been attributed to Pseudomonas sp. strain ADP first using alperujo as a more readily available source of N as compared to the parent triazines. In summary, addition of alperujo to the soils studied was shown to increase triazine herbicides sorption and hence to reduce its availability and potential to leach.

Original languageEnglish (US)
Pages (from-to)4112-4119
Number of pages8
JournalJournal of agricultural and food chemistry
Volume56
Issue number11
DOIs
StatePublished - Jun 11 2008

Keywords

  • Aging
  • Alperujo
  • Bioavailability
  • Olive oil mill waste
  • Pseudomonas sp. strain ADP
  • Soil
  • Sorption
  • Triazine herbicides

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