Runoff of Silvicultural Herbicides Applied Using Best Management Practices

Nine small (2.2-2.9 ha) and four large (70-135 ha) watersheds in East Texas, USA, were instrumented to compare herbicide runoff under different silvicultural systems with best management practices (BMPs). Two treatments were evaluated: conventional, with clearcutting, aerial herbicide site preparati...

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Bibliographic Details
Published in:Forest science 2013-04, Vol.59 (2), p.197-210
Main Authors: McBroom, Matthew W, Louch, Jeff, Beasley, R. Scott, Chang, Mingteh, Ice, George G
Format: Article
Language:English
Subjects:
Algae
base flow
best management practices
chronic exposure
clearcutting
Herbicides
hexazinone
imazapyr
pesticide application
runoff
sampling
site preparation
storms
streams
subsoiling
sulfometuron methyl
surface water
Water quality
Watersheds
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Summary:Nine small (2.2-2.9 ha) and four large (70-135 ha) watersheds in East Texas, USA, were instrumented to compare herbicide runoff under different silvicultural systems with best management practices (BMPs). Two treatments were evaluated: conventional, with clearcutting, aerial herbicide site preparation, and hand-applied banded herbaceous release; and intensive, in which subsoiling, aerial fertilization, and a 2nd-year aerial herbicide application were added. Herbicides were applied as operational tank mixes. The highest imazapyr concentration found in stream water was 39 μg L-1 during the first storm after application (23 days after treatment [DAT]) and in-stream concentrations during runoff events dropped to
ISSN:0015-749X
1938-3738
DOI:10.5849/forsci.11-012