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Spatial Inference of Herbicide Bioavailability Using a Geographic Information System

Published online by Cambridge University Press:  20 January 2017

Martin M. Williams II ,
David A. Mortensen ,
William J. Waltman  and
Alex R. Martin
Martin M. Williams II
Affiliation:
Irrigated Agriculture Research and Extension Center, Washington State University 24106 N. Bunn Road, Prosser, WA 99350-9687
David A. Mortensen
Affiliation:
Department of Agronomy, Research Coordinator, Department of Computer Science and Engineering
William J. Waltman*
Affiliation:
Department of Agronomy, University of Nebraska, Lincoln, NE 68583-0915
Alex R. Martin
Affiliation:
Department of Agronomy, University of Nebraska, Lincoln, NE 68583-0915
*
Corresponding author's E-mail: miwilliams@wsu.edu
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Abstract

This article presents an approach to managing and evaluating soil survey data that can aid in soil-applied herbicide decision making. Field experiments were used to quantify the dose responses of corn, shattercane, and velvetleaf to isoxaflutole over a range of soil conditions within an agricultural field. Isoxaflutole doses eliciting crop injury (20% greenness reduction) and weed control (80% biomasss reduction) were projected for a county located in Nebraska based on associations between the plant response and the soil properties. The biologically effective dose of isoxaflutole increased with increasing organic matter and mineral surface area. Mean biologically effective doses for velvetleaf (1 to 27 g/ha) were considerably lower than that for shattercane (42 to 206 g/ha). Over 60% of the surface texture is silty clay loam for Saunders County, suggesting that 17 and 158 g/ha are the minimal doses required to suppress velvetleaf and shattercane, respectively, for a majority of the county. Conceivably, this approach could be used as an initial step to assess the relative value of field-specific applications and variable dose application technologies.

Keywords

Isoxaflutoleshattercane, Sorghum bicolor (L.) Moench #3 SORBIvelvetleaf, Abutilon theophrasti Medicus # ABUTHcorn, Zea mays L.ARDC, Agriculture Research and Development CenterGIS, geographic information systemMUIR, map unit interpretation recordsOM, organic matterSSURGO, Soil Survey GeographicTIGER, topologically integrated geographic encoding and referencing
Type
Research
Information
Weed Technology , Volume 16 , Issue 3 , September 2002 , pp. 603 - 611
Copyright
Copyright © Weed Science Society of America 

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