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Spatial variability of imazethapyr sorption in soil

Published online by Cambridge University Press:  12 June 2017

Rubem S. Oliveira Jr. ,
William C. Koskinen ,
Francisco A. Ferreira ,
Bhairav R. Khakural ,
David J. Mulla  and
Pierre J. Robert
Rubem S. Oliveira Jr.
Affiliation:
Departamento de Agronomia, Universidade Estadual de Maringá, Maringá, PR 87020–900, Brazil
Francisco A. Ferreira
Affiliation:
Departamento de Fitotecnia, Universidade Federal de Viçosa, Viçosa, MG 36570–000, Brazil
Bhairav R. Khakural
Affiliation:
Department of Soils, Water, and Climate, University of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108
David J. Mulla
Affiliation:
Department of Soils, Water, and Climate, University of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108
Pierre J. Robert
Affiliation:
Department of Soils, Water, and Climate, University of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108
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Extract

A significant limitation in using sorption coefficients (Kd ) to predict solute transport through natural soils is the spatial variability of soil properties over large field areas. Spatial variability in Kd for imazethapyr was determined on representative samples from a 31.4-ha field, covering a pH range from 4.9 to 7.6 and an organic carbon (OC) range from 1.45 to 5.80 g kg−-1. Kd varied from 0.18 to 3.78 across the field, with an average value of 1.56. The analysis of Kd variability showed two distinct patterns in spatial distribution: areas in which pH > 6.25 and Kd < 1.5, where Kd variation is based primarily on pH, and areas in which pH < 6.25 and Kd > 1.5, where other soil properties, i.e., OC content, have a significant influence on Kd variation. Based on soil pH distribution, an easily measured property, the field was divided into two potential management areas. This separation allowed identification of portions of the field where herbicide sorption would be minimal, with a relatively higher potential for leaching (i.e., areas with Kd < 1.5), and provided a rationale for site-specific imazethapyr application.

Keywords

ImazethapyratrazinealachlorSorption, spatial variability
Type
Soil, Air, and Water
Information
Weed Science , Volume 47 , Issue 2 , April 1999 , pp. 243 - 248
Copyright
Copyright © 1999 by the Weed Science Society of America 

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