Submitted to: Symposium on the Fate and Chemistry of Modern Pesticides Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 10/22/2008
Publication Date: 10/22/2008
Citation: Cabrera, A., Cox, L., Cornejo, J., Koskinen, W.C., Sadowsky, M.J. 2008. Influence of an Organic Waste Used as Soil Amendment on Triazine Herbicide Sorption and Availability. Symposium on the Fate and Chemistry of Modern Pesticides Proceedings. October 22-25, 2008. Marseille, France. p. 22.
Technical Abstract: In this work we have studied the influence of an organic waste generated in the olive oil mill process, used as soil amendment, on atrazine and terbuthylazine sorption and availability in soil. The soils studied were two sandy soils with different origin, Spain and Minnesota and the effect of soil aging on herbicide sorption and availability was also studied. The amendment was applied to soils in the laboratory and organic matter content of soils increased 8 and 3 fold in the soil from Spain and from Minnesota respectively. Herbicide sorption was studied with water and methanol extraction method, and triazine availability was determined using Pseudomonas sp. strain ADP, a ring atrazine degrading microorganism. The amendment increased both herbicides sorption in soils, as compared with the non amended soils, however, showed no effect on sorption with time, meanwhile in non amended soils herbicide sorption increased with aging time. Herbicide mineralization by Pseudomonas sp. strain ADP was lower in amended soils than in non amended soils and usually increased herbicide mineralization in unamended soils with increasing time. Addition of olive oil mill waste to soils increased atrazine and terbuthylazine sorption and reduced availability of the herbicides as compared with the non amended soils.