Glyphosate Mineralization: Effect of Temperature and Soybean and Corn Crop Residues

Mineralization is the main mechanism of dissipation of glyphosate herbicide (N-[phosphonomethyl] glycine) in soil. However, there is scarce information about the mineralization process in strata formed by stubbles in no-tillage systems. The kinetics and rate of mineralization of herbicide in stubble...

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Autores principales:	Rampoldi,Ariel, Hang,Susana, Barriuso,Enrique
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2008
Materias:	glyphosate stubbles mineralization non-tillage system total microbial activity
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000100002
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spelling	oai:scielo:S0718-583920080001000022018-10-01Glyphosate Mineralization: Effect of Temperature and Soybean and Corn Crop ResiduesRampoldi,ArielHang,SusanaBarriuso,Enrique glyphosate stubbles mineralization non-tillage system total microbial activity Mineralization is the main mechanism of dissipation of glyphosate herbicide (N-[phosphonomethyl] glycine) in soil. However, there is scarce information about the mineralization process in strata formed by stubbles in no-tillage systems. The kinetics and rate of mineralization of herbicide in stubbles of soybean (Glycine max L. Merr.) and corn (Zea mays L.) were investigated. To evaluate the effect of age of crop residues, samples of soybean stubbles were collected immediately after harvest (Soja 1) and four months after harvest (Soja 2). Corn crop residues were collected three months after harvest. Glyphosate evolution and total microbial activity (TMA) were monitored by release of 14C-CO2 and C-CO2 under laboratory conditions with two temperatures, 15 and 28 °C. Crop residues size was evaluated using grinding (1 mm) and cut (1 to 2 cm) stubbles. Results showed that glyphosate mineralization was affected by the incubation temperature and the origin and age of crop residues. Size of crop residues did not modify glyphosate mineralization. Average glyphosate mineralization after 56 days of incubation at 15 and 28 °C was of 3.9 and 9.9%, respectively, of the 14C-glyphosate initially applied. In maize crop residues the percentages were 2.0 and 3.0%, respectively, at 15 and 28 °C. A similar evolution was detected for TMA. The co-metabolic nature of glyphosate mineralization was corroborated. An inverse relation between C/N ratio and glyphosate mineralization was detected. Higher glyphosate mineralization was detected in fresh soybean stubbles, suggesting that applications on aged crop residues could increase the persistence of glyphosate in no-tillage systemsinfo:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.68 n.1 20082008-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000100002en10.4067/S0718-58392008000100002
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	glyphosate stubbles mineralization non-tillage system total microbial activity
spellingShingle	glyphosate stubbles mineralization non-tillage system total microbial activity Rampoldi,Ariel Hang,Susana Barriuso,Enrique Glyphosate Mineralization: Effect of Temperature and Soybean and Corn Crop Residues
description	Mineralization is the main mechanism of dissipation of glyphosate herbicide (N-[phosphonomethyl] glycine) in soil. However, there is scarce information about the mineralization process in strata formed by stubbles in no-tillage systems. The kinetics and rate of mineralization of herbicide in stubbles of soybean (Glycine max L. Merr.) and corn (Zea mays L.) were investigated. To evaluate the effect of age of crop residues, samples of soybean stubbles were collected immediately after harvest (Soja 1) and four months after harvest (Soja 2). Corn crop residues were collected three months after harvest. Glyphosate evolution and total microbial activity (TMA) were monitored by release of 14C-CO2 and C-CO2 under laboratory conditions with two temperatures, 15 and 28 °C. Crop residues size was evaluated using grinding (1 mm) and cut (1 to 2 cm) stubbles. Results showed that glyphosate mineralization was affected by the incubation temperature and the origin and age of crop residues. Size of crop residues did not modify glyphosate mineralization. Average glyphosate mineralization after 56 days of incubation at 15 and 28 °C was of 3.9 and 9.9%, respectively, of the 14C-glyphosate initially applied. In maize crop residues the percentages were 2.0 and 3.0%, respectively, at 15 and 28 °C. A similar evolution was detected for TMA. The co-metabolic nature of glyphosate mineralization was corroborated. An inverse relation between C/N ratio and glyphosate mineralization was detected. Higher glyphosate mineralization was detected in fresh soybean stubbles, suggesting that applications on aged crop residues could increase the persistence of glyphosate in no-tillage systems
author	Rampoldi,Ariel Hang,Susana Barriuso,Enrique
author_facet	Rampoldi,Ariel Hang,Susana Barriuso,Enrique
author_sort	Rampoldi,Ariel
title	Glyphosate Mineralization: Effect of Temperature and Soybean and Corn Crop Residues
title_short	Glyphosate Mineralization: Effect of Temperature and Soybean and Corn Crop Residues
title_full	Glyphosate Mineralization: Effect of Temperature and Soybean and Corn Crop Residues
title_fullStr	Glyphosate Mineralization: Effect of Temperature and Soybean and Corn Crop Residues
title_full_unstemmed	Glyphosate Mineralization: Effect of Temperature and Soybean and Corn Crop Residues
title_sort	glyphosate mineralization: effect of temperature and soybean and corn crop residues
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000100002
work_keys_str_mv	AT rampoldiariel glyphosatemineralizationeffectoftemperatureandsoybeanandcorncropresidues AT hangsusana glyphosatemineralizationeffectoftemperatureandsoybeanandcorncropresidues AT barriusoenrique glyphosatemineralizationeffectoftemperatureandsoybeanandcorncropresidues
_version_	1714205257922248704

Glyphosate Mineralization: Effect of Temperature and Soybean and Corn Crop Residues

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