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GLYPHOSATE ADSORPTION IN TWO AGRICULTURAL SOILS IN NORTHERN ARGENTINA.

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Title: GLYPHOSATE ADSORPTION IN TWO AGRICULTURAL SOILS IN NORTHERN ARGENTINA.
Alternate Title: ADSORCIÓN DE GLIFOSATO EN DOS SUELOS AGRÍCOLAS DEL NORTE DE ARGENTINA.
Authors: Mas, Laura Inés1 mas.laura@inta.gob.ar, Aparicio, Virginia Carolina2
Source: Ciencia del Suelo. jun2026, Vol. 44 Issue 1, p47-58. 12p.
Abstract (English): Glyphosate is the most widely used herbicide in Argentina and it has been detected in various environmental matrices, raising the need to study its behavior in soils from different regions of the country. Since adsorption is the most important process governing the fate of glyphosate, the aim of this work was to study this phenomenon in the A, Bt1, Bt2, BC and Ck horizons of an Aquic Argiustoll, and in the A, AC, C and Ck horizons of an Entic Haplustoll, both from the east of the province of Santiago del Estero. For such purpose, the batch equilibrium technique was used, and isotherms were fitted using the Freundlich model This model adequately described isotherms (R² = 0.97). Both soils had adsorption percentages greater than 62 %, showing remarkably high glyphosate retention coefficients in all horizons and a progressive decrease with depth. This decrease was mainly related to an increase in pH and sand content, and a decrease in cation exchange capacity, as well as clay and organic carbon contents. The observed reduction in glyphosate retention was more evident in the Entic Haplustoll soil. In contrast, the Aquic Argiustoll soil showed greater glyphosate absorption, which would result in a lower probability of leaching for the Aquic Argiustoll and a lower risk of groundwater contamination. [ABSTRACT FROM AUTHOR]
Abstract (Spanish): El glifosato es el herbicida más utilizado en Argentina y se ha detectado en diversas matrices ambientales, lo que plantea la necesidad de estudiar su comportamiento en suelos de diferentes regiones del país. Dado que la adsorción es el proceso más importante que regula el destino del glifosato, el objetivo de este trabajo fue estudiar este fenómeno en los horizontes A, Bt1, Bt2, BC y Ck de un Argiustol ácuico, y en los horizontes A, AC, C y Ck de un Haplustol éntico, ambos del este de la provincia de Santiago del Estero. Para ello, se empleó la técnica de batch equilibrium y se ajustaron las isotermas mediante el modelo de Freundlich. Este modelo describió adecuadamente las isotermas (R² = 0,97). Ambos suelos presentaron porcentajes de adsorción superiores al 62 %, mostrando coeficientes de retención de glifosato muy elevados en todos los horizontes y una disminución progresiva con la profundidad. Esta disminución se relacionó principalmente con un aumento del pH y el porcentaje de arena, y con una disminución de los valores de arcilla, la capacidad de intercambio catiónico y el contenido de carbono orgánico. Esta disminución fue más evidente en el Haplustol éntico; por lo tanto, el Argiustol ácuico presentó una mayor capacidad de adsorción de glifosato. La mayor retención del Argiustol ácuico resultaría en una menor probabilidad de lixiviación y un menor riesgo de contaminación de las aguas subterráneas. [ABSTRACT FROM AUTHOR]
Copyright of Ciencia del Suelo is the property of Asociacion Argentina de la Ciencia del Suelo (AACS) and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: GLYPHOSATE ADSORPTION IN TWO AGRICULTURAL SOILS IN NORTHERN ARGENTINA.
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  Label: Alternate Title
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  Data: ADSORCIÓN DE GLIFOSATO EN DOS SUELOS AGRÍCOLAS DEL NORTE DE ARGENTINA.
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  Data: <searchLink fieldCode="AR" term="%22Mas%2C+Laura+Inés%22">Mas, Laura Inés</searchLink><relatesTo>1</relatesTo><i> mas.laura@inta.gob.ar</i><br /><searchLink fieldCode="AR" term="%22Aparicio%2C+Virginia+Carolina%22">Aparicio, Virginia Carolina</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Ciencia+del+Suelo%22">Ciencia del Suelo</searchLink>. jun2026, Vol. 44 Issue 1, p47-58. 12p.
– Name: Abstract
  Label: Abstract (English)
  Group: Ab
  Data: Glyphosate is the most widely used herbicide in Argentina and it has been detected in various environmental matrices, raising the need to study its behavior in soils from different regions of the country. Since adsorption is the most important process governing the fate of glyphosate, the aim of this work was to study this phenomenon in the A, Bt1, Bt2, BC and Ck horizons of an Aquic Argiustoll, and in the A, AC, C and Ck horizons of an Entic Haplustoll, both from the east of the province of Santiago del Estero. For such purpose, the batch equilibrium technique was used, and isotherms were fitted using the Freundlich model This model adequately described isotherms (R² = 0.97). Both soils had adsorption percentages greater than 62 %, showing remarkably high glyphosate retention coefficients in all horizons and a progressive decrease with depth. This decrease was mainly related to an increase in pH and sand content, and a decrease in cation exchange capacity, as well as clay and organic carbon contents. The observed reduction in glyphosate retention was more evident in the Entic Haplustoll soil. In contrast, the Aquic Argiustoll soil showed greater glyphosate absorption, which would result in a lower probability of leaching for the Aquic Argiustoll and a lower risk of groundwater contamination. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label: Abstract (Spanish)
  Group: Ab
  Data: El glifosato es el herbicida más utilizado en Argentina y se ha detectado en diversas matrices ambientales, lo que plantea la necesidad de estudiar su comportamiento en suelos de diferentes regiones del país. Dado que la adsorción es el proceso más importante que regula el destino del glifosato, el objetivo de este trabajo fue estudiar este fenómeno en los horizontes A, Bt1, Bt2, BC y Ck de un Argiustol ácuico, y en los horizontes A, AC, C y Ck de un Haplustol éntico, ambos del este de la provincia de Santiago del Estero. Para ello, se empleó la técnica de batch equilibrium y se ajustaron las isotermas mediante el modelo de Freundlich. Este modelo describió adecuadamente las isotermas (R² = 0,97). Ambos suelos presentaron porcentajes de adsorción superiores al 62 %, mostrando coeficientes de retención de glifosato muy elevados en todos los horizontes y una disminución progresiva con la profundidad. Esta disminución se relacionó principalmente con un aumento del pH y el porcentaje de arena, y con una disminución de los valores de arcilla, la capacidad de intercambio catiónico y el contenido de carbono orgánico. Esta disminución fue más evidente en el Haplustol éntico; por lo tanto, el Argiustol ácuico presentó una mayor capacidad de adsorción de glifosato. La mayor retención del Argiustol ácuico resultaría en una menor probabilidad de lixiviación y un menor riesgo de contaminación de las aguas subterráneas. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ciencia del Suelo is the property of Asociacion Argentina de la Ciencia del Suelo (AACS) and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.64132/cds.v44i1.950
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      – TitleFull: GLYPHOSATE ADSORPTION IN TWO AGRICULTURAL SOILS IN NORTHERN ARGENTINA.
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              Text: jun2026
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              Y: 2026
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