Reduction of pesticide pollution in agricutural soils by using controlled release formulations: Efficacy and persistence studies

The application rates for conventional herbicide formulations are generally greater than the recommended dosage, in order to overcome losses from degradation, leaching, volatilization, and sorption during the time needed for weed control. All these factors have encouraged the development of controll...

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Autores: Sopeña-Vázquez, Fátima, Morillo González, Esmeralda, Villaverde Capellán, J., Maqueda Porras, Celia
Tipo de recurso: artículo
Fecha de publicación:2008
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/62195
Acceso en línea:http://hdl.handle.net/10261/62195
Access Level:acceso abierto
Palabra clave:Ethylcellulose microencapsulated formulations
Efficacy
Persistence
Alachlor
Bioassay
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spelling Reduction of pesticide pollution in agricutural soils by using controlled release formulations: Efficacy and persistence studiesSopeña-Vázquez, FátimaMorillo González, EsmeraldaVillaverde Capellán, J.Maqueda Porras, CeliaEthylcellulose microencapsulated formulationsEfficacyPersistenceAlachlorBioassayThe application rates for conventional herbicide formulations are generally greater than the recommended dosage, in order to overcome losses from degradation, leaching, volatilization, and sorption during the time needed for weed control. All these factors have encouraged the development of controlled release formulations (CRFs), which can reduce herbicides levels in the environment since less active ingredient need to be applied for maintaining the herbicidal efficacy. For soil applied herbicides, such as alachlor and norflurazon, the residual weed control is dependent on herbicide persistence and availability in soil. The present study describes the preparation, characterization and application to soil of CRFs containing the herbicides norflurazon and alachlor. Ethylcellulose formulations were obtained by a microencapsulation technique. The results of the in vitro release studies in water showed that a prolonged release of the herbicides to solution was successfully achieved by using ethylcellulose microspheres. In order to compare the herbicidal efficacy and persistence of norflurazon and alachlor applied as microencapsulated formulations with the commercial formulations, bioassay experiments were carried out. The formulations were applied as preemergence herbicides at 0.8 and 1.6 mg kg-1 for norflurazon and alachlor, respectively, and oat (soils treated with alachlor) and soybean (soils treated with norflurazon) seeds were sown. The herbicide persistence in soil was studied sowing fresh seeds in each pot at different times after herbicides treatment. The results showed that the ethyl-cellulose microencapsulated formulations of norflurazon and alachlor protected the herbicides against their dissipation in soil, and remained biologically active longer than the commercial formulations.F.S. acknowledges an investigating contract from the Junta de Andalucía. This work was supported by MEC (Spanish Ministry of Education and Science), Research Projects REN2003-01509, AGL 2005-00164, and Junta de Andalucía, P06-FQM-1909.Peer ReviewedTechnische Universität MünchenJunta de AndalucíaMinisterio de Educación y Ciencia (España)2012201220082012info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/62195reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglésinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/621952026-05-22T06:33:51Z
dc.title.none.fl_str_mv Reduction of pesticide pollution in agricutural soils by using controlled release formulations: Efficacy and persistence studies
title Reduction of pesticide pollution in agricutural soils by using controlled release formulations: Efficacy and persistence studies
spellingShingle Reduction of pesticide pollution in agricutural soils by using controlled release formulations: Efficacy and persistence studies
Sopeña-Vázquez, Fátima
Ethylcellulose microencapsulated formulations
Efficacy
Persistence
Alachlor
Bioassay
title_short Reduction of pesticide pollution in agricutural soils by using controlled release formulations: Efficacy and persistence studies
title_full Reduction of pesticide pollution in agricutural soils by using controlled release formulations: Efficacy and persistence studies
title_fullStr Reduction of pesticide pollution in agricutural soils by using controlled release formulations: Efficacy and persistence studies
title_full_unstemmed Reduction of pesticide pollution in agricutural soils by using controlled release formulations: Efficacy and persistence studies
title_sort Reduction of pesticide pollution in agricutural soils by using controlled release formulations: Efficacy and persistence studies
dc.creator.none.fl_str_mv Sopeña-Vázquez, Fátima
Morillo González, Esmeralda
Villaverde Capellán, J.
Maqueda Porras, Celia
author Sopeña-Vázquez, Fátima
author_facet Sopeña-Vázquez, Fátima
Morillo González, Esmeralda
Villaverde Capellán, J.
Maqueda Porras, Celia
author_role author
author2 Morillo González, Esmeralda
Villaverde Capellán, J.
Maqueda Porras, Celia
author2_role author
author
author
dc.contributor.none.fl_str_mv Junta de Andalucía
Ministerio de Educación y Ciencia (España)
dc.subject.none.fl_str_mv Ethylcellulose microencapsulated formulations
Efficacy
Persistence
Alachlor
Bioassay
topic Ethylcellulose microencapsulated formulations
Efficacy
Persistence
Alachlor
Bioassay
description The application rates for conventional herbicide formulations are generally greater than the recommended dosage, in order to overcome losses from degradation, leaching, volatilization, and sorption during the time needed for weed control. All these factors have encouraged the development of controlled release formulations (CRFs), which can reduce herbicides levels in the environment since less active ingredient need to be applied for maintaining the herbicidal efficacy. For soil applied herbicides, such as alachlor and norflurazon, the residual weed control is dependent on herbicide persistence and availability in soil. The present study describes the preparation, characterization and application to soil of CRFs containing the herbicides norflurazon and alachlor. Ethylcellulose formulations were obtained by a microencapsulation technique. The results of the in vitro release studies in water showed that a prolonged release of the herbicides to solution was successfully achieved by using ethylcellulose microspheres. In order to compare the herbicidal efficacy and persistence of norflurazon and alachlor applied as microencapsulated formulations with the commercial formulations, bioassay experiments were carried out. The formulations were applied as preemergence herbicides at 0.8 and 1.6 mg kg-1 for norflurazon and alachlor, respectively, and oat (soils treated with alachlor) and soybean (soils treated with norflurazon) seeds were sown. The herbicide persistence in soil was studied sowing fresh seeds in each pot at different times after herbicides treatment. The results showed that the ethyl-cellulose microencapsulated formulations of norflurazon and alachlor protected the herbicides against their dissipation in soil, and remained biologically active longer than the commercial formulations.
publishDate 2008
dc.date.none.fl_str_mv 2008
2012
2012
2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/62195
url http://hdl.handle.net/10261/62195
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Technische Universität München
publisher.none.fl_str_mv Technische Universität München
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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