Adsorption and transport of imazapyr through intact soil columns taken from two soils under two tillage systems

Authors
Porfiri, Carolina; Montoya, Jorgelina Ceferina; Koskinen, William C.; Azcarate, Mariela Pamela
Publication Year
2015
Language
English
Format
article
Status
Published version
Description
The objective of this work was to study the sorption and transport of imazapyr (IMZ) in two soils with different physical–chemical properties, subject to long-term conventional tillage (CT) and no-tillage (NT) systems. Sorption was carried out using batch equilibrium method and high performance liquid chromatography analytical routines. Displacement experiments through intact soil cores were done using IMZ as reactive solute and bromide (Br) as non-reactive solute. Equilibrium (CDEeq) and non-equilibrium (CDEnon-eq) transport models (CXTFIT 2.1) were employed to describe the breakthrough curves (BTCs). IMZ was only sorbed by NT soils with Kd values ranging from 0.22 to 1.1 L kg−1 . Clay content, pH and CEC values were the main factors affecting the sorption of IMZ. Miscible displacement studies showed that almost all the soil water was mobile and transport was related to physical equilibrium conditions. Some evidence of sorption non-equilibrium was seen in column experiments with IMZ; retardation factors were close to one, demonstrating the low sorption and the high potential to leach of this compound.
Fil: Porfiri, Carolina. INTA. Estación Experimental Agropecuaria Anguil; Argentina
Fil: Montoya, Jorgelina Ceferina. INTA. Estación Experimental Agropecuaria Anguil; Argentina
Fil: Koskinen, William C. Department of Agriculture. Agricultural Research Service. Soil and Water Management Research Unit; Estados Unidos
Fil: Azcarate, Mariela Pamela. INTA. Estación Experimental Agropecuaria Anguil; Argentina
Source
Geoderma 251–252 : 1-9. (August 2015)
Subject
Sorción
Imazapir
Lixiviación
Propiedades Físico-Químicas Suelo
Labranza Convencional
Conventional Tillage
Soil Chemicophysical Properties
Soil Properties
Leaching
Imazapyr
Sorption
Access level
Restricted access
License
Repository
INTA Digital (INTA)
Institution
Instituto Nacional de Tecnología Agropecuaria
OAI Identifier
oai:localhost:20.500.12123/2108