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Coupling Geographic Information Systems and Models for Weed Control and Groundwater Protection

Published online by Cambridge University Press:  12 June 2017

John P. Wilson ,
William P. Inskeep ,
Paul R. Rubright ,
Diana Cooksey ,
Jeffrey S. Jacobsen  and
Robert D. Snyder
John P. Wilson
Affiliation:
Plant Soil Sci.; and GIS Tech., Geogr. Info. Anal. Cent., Montana State Univ., Bozeman, MT 59717
William P. Inskeep
Affiliation:
Plant Soil Sci.; and GIS Tech., Geogr. Info. Anal. Cent., Montana State Univ., Bozeman, MT 59717
Paul R. Rubright
Affiliation:
Plant Soil Sci.; and GIS Tech., Geogr. Info. Anal. Cent., Montana State Univ., Bozeman, MT 59717
Diana Cooksey
Affiliation:
Plant Soil Sci.; and GIS Tech., Geogr. Info. Anal. Cent., Montana State Univ., Bozeman, MT 59717
Jeffrey S. Jacobsen
Affiliation:
Plant Soil Sci.; and GIS Tech., Geogr. Info. Anal. Cent., Montana State Univ., Bozeman, MT 59717
Robert D. Snyder
Affiliation:
Plant Soil Sci.; and GIS Tech., Geogr. Info. Anal. Cent., Montana State Univ., Bozeman, MT 59717
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Abstract

The Chemical Movement through Layered Soils (CMLS) model was modified and combined with the USDA-SCS State Soil Geographic Data Base (STATSGO) and Montana Agricultural Potentials System (MAPS) digital databases to assess the likelihood of groundwater contamination from selected herbicides in Teton County, MT. The STATSGO and MAPS databases were overlaid to produce polygons with unique soil and climate characteristics and attribute tables containing only those data needed by the CMLS model. The Weather Generator (WGEN) computer simulation model was modified and used to generate daily precipitation and evapotranspiration values. A new algorithm was developed to estimate soil carbon as a function of soil depth. The depth of movement of the applied chemicals at the end of the growing season was estimated with CMLS for each of the soil series in the STATSGO soil mapping units and the results were entered into ARC/INFO to produce the final hazard maps showing best, weighted average, and worst case results for every unique combination (polygon) of soil mapping unit and climate. County weed infestation maps for leafy spurge and spotted knapweed were digitized and overlaid in ARC/INFO with the CMLS model results for picloram to illustrate how the results might be used to evaluate the threat to groundwater posed by current herbicide applications.

Keywords

Picloram (4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid)leafy spurge, Euphorbia esula L. # EPHESspotted knapweed, Centaurea maculosa Lam. # CENMAGroundwater contaminationcomputer modelCentaurea maculosaEuphorbia esulaCENMAEPHES

Information

Type
Symposium
Information
Weed Technology , Volume 7 , Issue 1 , March 1993 , pp. 255 - 264
Copyright
Copyright © 1993 by the Weed Science Society of America 

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References

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