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Organoclays as soil amendments to increase the efficacy and reduce the environmental impact of the herbicide fluometuron in agricultural soils.
J Agric Food Chem. 2010 Jul 14; 58(13):7893-901.JA

Abstract

The use of pesticides in agriculture has become a source of pollution of soil and water in the last decades. Extensive pesticide transport losses due to leaching and runoff produce nonpoint source contamination of soils and water. One of the soil processes that reduce pesticide transport losses is adsorption by soil particles; therefore, enhancement of pesticide retention by soil can be used as a strategy to attenuate the environmental impact of pesticides. In this work, organoclays were prepared by treating Wyoming montmorillonite (SWy-2) and Arizona montmorillonite (SAz-1) with different organic cations and were assayed as soil amendments to enhance the retention and reduce the leaching losses of the herbicide fluometuron [N,N-dimethyl-N'-[3-(trifluoromethyl)phenyl] urea] in soils. Two agricultural soils from Southern Spain were selected for being high-risk scenarios of ground and surface water contamination. First, a batch adsorption study was conducted to identify organoclays with high affinity for fluometuron. Among the different organoclays assayed, spermine-treated Wyoming montmorillonite (SW-SPERM) displayed high and reversible adsorption of fluometuron and was selected as an amendment for subsequent persistence, leaching, and herbicidal activity experiments of fluometuron with unamended and amended soils. Amendment of the soils with SW-SPERM at rates of 1%, 2%, and 5% greatly enhanced fluometuron retention by the soils and retarded fluometuron leaching through soil columns. Incubation experiments revealed that the persistence of the herbicide in the amended soils was similar to that in unamended soils and that most of the herbicide was ultimately available for degradation. Bioassays demonstrated that the reduced leaching losses of fluometuron in soils amended with SW-SPERM may result in increased herbicide efficacy if heavy rainfall events occur shortly after herbicide application.

Authors+Show Affiliations

Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS), CSIC, Avenida Reina Mercedes 10, P.O. Box 1052, 41080 Sevilla, Spain.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20545302

Citation

Gámiz, Beatriz, et al. "Organoclays as Soil Amendments to Increase the Efficacy and Reduce the Environmental Impact of the Herbicide Fluometuron in Agricultural Soils." Journal of Agricultural and Food Chemistry, vol. 58, no. 13, 2010, pp. 7893-901.
Gámiz B, Celis R, Hermosín MC, et al. Organoclays as soil amendments to increase the efficacy and reduce the environmental impact of the herbicide fluometuron in agricultural soils. J Agric Food Chem. 2010;58(13):7893-901.
Gámiz, B., Celis, R., Hermosín, M. C., & Cornejo, J. (2010). Organoclays as soil amendments to increase the efficacy and reduce the environmental impact of the herbicide fluometuron in agricultural soils. Journal of Agricultural and Food Chemistry, 58(13), 7893-901. https://doi.org/10.1021/jf100760s
Gámiz B, et al. Organoclays as Soil Amendments to Increase the Efficacy and Reduce the Environmental Impact of the Herbicide Fluometuron in Agricultural Soils. J Agric Food Chem. 2010 Jul 14;58(13):7893-901. PubMed PMID: 20545302.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Organoclays as soil amendments to increase the efficacy and reduce the environmental impact of the herbicide fluometuron in agricultural soils. AU - Gámiz,Beatriz, AU - Celis,Rafael, AU - Hermosín,María C, AU - Cornejo,Juan, PY - 2010/6/16/entrez PY - 2010/6/16/pubmed PY - 2010/10/22/medline SP - 7893 EP - 901 JF - Journal of agricultural and food chemistry JO - J Agric Food Chem VL - 58 IS - 13 N2 - The use of pesticides in agriculture has become a source of pollution of soil and water in the last decades. Extensive pesticide transport losses due to leaching and runoff produce nonpoint source contamination of soils and water. One of the soil processes that reduce pesticide transport losses is adsorption by soil particles; therefore, enhancement of pesticide retention by soil can be used as a strategy to attenuate the environmental impact of pesticides. In this work, organoclays were prepared by treating Wyoming montmorillonite (SWy-2) and Arizona montmorillonite (SAz-1) with different organic cations and were assayed as soil amendments to enhance the retention and reduce the leaching losses of the herbicide fluometuron [N,N-dimethyl-N'-[3-(trifluoromethyl)phenyl] urea] in soils. Two agricultural soils from Southern Spain were selected for being high-risk scenarios of ground and surface water contamination. First, a batch adsorption study was conducted to identify organoclays with high affinity for fluometuron. Among the different organoclays assayed, spermine-treated Wyoming montmorillonite (SW-SPERM) displayed high and reversible adsorption of fluometuron and was selected as an amendment for subsequent persistence, leaching, and herbicidal activity experiments of fluometuron with unamended and amended soils. Amendment of the soils with SW-SPERM at rates of 1%, 2%, and 5% greatly enhanced fluometuron retention by the soils and retarded fluometuron leaching through soil columns. Incubation experiments revealed that the persistence of the herbicide in the amended soils was similar to that in unamended soils and that most of the herbicide was ultimately available for degradation. Bioassays demonstrated that the reduced leaching losses of fluometuron in soils amended with SW-SPERM may result in increased herbicide efficacy if heavy rainfall events occur shortly after herbicide application. SN - 1520-5118 UR - https://www.unboundmedicine.com/medline/citation/20545302/Organoclays_as_soil_amendments_to_increase_the_efficacy_and_reduce_the_environmental_impact_of_the_herbicide_fluometuron_in_agricultural_soils_ L2 - https://doi.org/10.1021/jf100760s DB - PRIME DP - Unbound Medicine ER -