Rhizosphere effect on pesticide degradation in biobeds under different hydraulic loads

Interactions between microorganisms and root exudates in a biobed system with vegetal (grass) cover could enhance pesticide degradation. Otherwise, a high water load may generate high concentrations of pesticides in lixiviates. We studied the effect of the vegetal cover on the degradation of a mixtu...

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Autores principales:	Diez,M.C, Schalchli,H, Elgueta,S, Salgado,E, Millahueque,N, Rubilar,O, Tortella,G.R, Briceño,G
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2015
Materias:	Biobed pesticide leaching root exudates organic acids
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162015000200009
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spelling	oai:scielo:S0718-951620150002000092015-09-29Rhizosphere effect on pesticide degradation in biobeds under different hydraulic loadsDiez,M.CSchalchli,HElgueta,SSalgado,EMillahueque,NRubilar,OTortella,G.RBriceño,G Biobed pesticide leaching root exudates organic acids Interactions between microorganisms and root exudates in a biobed system with vegetal (grass) cover could enhance pesticide degradation. Otherwise, a high water load may generate high concentrations of pesticides in lixiviates. We studied the effect of the vegetal cover on the degradation of a mixture of atrazine (ATZ), chlorpyrifos (CHL) and iprodione (IPR) (35 mg L-1 each) in a biobed system operated with two different hydraulic loads (0.6 and 1.2 L of tap water per day). The concentration of the pesticides and their main metabolites were measured in the lixiviates during 60 days, as well as in the biomixtures at the end of the study. Dehydrogenase activity in the biomixtures and organic acid exudation from the vegetal cover were also analysed. The vegetal cover diminished the lixiviation of pesticides and their metabolites mainly at the lower hydraulic load used. The degradation of the pesticides was high (>95%) and increased in biobeds with vegetal cover and low hydraulic load. Degradation metabolites of CHL and IPR were formed during pesticide degradation; however they were degraded in the biobed and were not detected in lixiviates at the end of the study. In general, an increase in organic acid exudation by vegetal cover was observed caused by chemical stress after pesticide application. The increase was similar at both hydraulic loads. Efficient colonisation of wheat straw by fungi was observed by confocal microscopy.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.15 n.2 20152015-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162015000200009en10.4067/S0718-95162015005000037
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Biobed pesticide leaching root exudates organic acids
spellingShingle	Biobed pesticide leaching root exudates organic acids Diez,M.C Schalchli,H Elgueta,S Salgado,E Millahueque,N Rubilar,O Tortella,G.R Briceño,G Rhizosphere effect on pesticide degradation in biobeds under different hydraulic loads
description	Interactions between microorganisms and root exudates in a biobed system with vegetal (grass) cover could enhance pesticide degradation. Otherwise, a high water load may generate high concentrations of pesticides in lixiviates. We studied the effect of the vegetal cover on the degradation of a mixture of atrazine (ATZ), chlorpyrifos (CHL) and iprodione (IPR) (35 mg L-1 each) in a biobed system operated with two different hydraulic loads (0.6 and 1.2 L of tap water per day). The concentration of the pesticides and their main metabolites were measured in the lixiviates during 60 days, as well as in the biomixtures at the end of the study. Dehydrogenase activity in the biomixtures and organic acid exudation from the vegetal cover were also analysed. The vegetal cover diminished the lixiviation of pesticides and their metabolites mainly at the lower hydraulic load used. The degradation of the pesticides was high (>95%) and increased in biobeds with vegetal cover and low hydraulic load. Degradation metabolites of CHL and IPR were formed during pesticide degradation; however they were degraded in the biobed and were not detected in lixiviates at the end of the study. In general, an increase in organic acid exudation by vegetal cover was observed caused by chemical stress after pesticide application. The increase was similar at both hydraulic loads. Efficient colonisation of wheat straw by fungi was observed by confocal microscopy.
author	Diez,M.C Schalchli,H Elgueta,S Salgado,E Millahueque,N Rubilar,O Tortella,G.R Briceño,G
author_facet	Diez,M.C Schalchli,H Elgueta,S Salgado,E Millahueque,N Rubilar,O Tortella,G.R Briceño,G
author_sort	Diez,M.C
title	Rhizosphere effect on pesticide degradation in biobeds under different hydraulic loads
title_short	Rhizosphere effect on pesticide degradation in biobeds under different hydraulic loads
title_full	Rhizosphere effect on pesticide degradation in biobeds under different hydraulic loads
title_fullStr	Rhizosphere effect on pesticide degradation in biobeds under different hydraulic loads
title_full_unstemmed	Rhizosphere effect on pesticide degradation in biobeds under different hydraulic loads
title_sort	rhizosphere effect on pesticide degradation in biobeds under different hydraulic loads
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2015
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162015000200009
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Rhizosphere effect on pesticide degradation in biobeds under different hydraulic loads

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