Deposition of aerially applied spray to a stream within a vegetative barrier

Thistle, H. W., Ice, G. G., Karsky, R.L., Hewitt, A.J. and Dorr, G. (2009). Deposition of aerially applied spray to a stream within a vegetative barrier. In: Paul H. Heinemann, James A. Lindley, Kyle R. Douglas-Mankin, Virendra M. Puri, Kenneth A. Sudduth, Fredrick W. Wheaton, Roy E. Young and Naiqian Zhang, 2007 ASABE Annual International Meeting, Minneapolis, MN, United States, (1481-1490). 2007. doi:doi: 10.13031/2013.29128

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Author Thistle, H. W.
Ice, G. G.
Karsky, R.L.
Hewitt, A.J.
Dorr, G.
Title of paper Deposition of aerially applied spray to a stream within a vegetative barrier
Conference name 2007 ASABE Annual International Meeting
Conference location Minneapolis, MN, United States
Conference dates 2007
Journal name Transactions of the ASABE   Check publisher's open access policy
Place of Publication Joseph, MI, United States
Publisher American Society of Agricultural and Biological Engineers
Publication Year 2009
Sub-type Fully published paper
DOI doi: 10.13031/2013.29128
Open Access Status File (Publisher version)
ISSN 0001-2351
Editor Paul H. Heinemann
James A. Lindley
Kyle R. Douglas-Mankin
Virendra M. Puri
Kenneth A. Sudduth
Fredrick W. Wheaton
Roy E. Young
Naiqian Zhang
Volume 52
Issue 5
Start page 1481
End page 1490
Total pages 10
Language eng
Abstract/Summary Drift of aerially applied forest herbicides can result in chemical deposition to streams. Riparian vegetation is expected to attenuate drift, but there is little corresponding data. A field study was conducted in the Coast Range west of Corvallis, Oregon, to evaluate the effectiveness of forested riparian buffers. The buffers studied are typical of those used for small and medium fish-bearing streams in western Oregon as mandated by the Oregon Forest Practices Act. A helicopter sprayed two tracers over four transects. Twenty trials were conducted, resulting in over 1400 tracer samples. Results confirm that these vegetative barriers are effective at reducing deposition into streams. Reduction of deposition on artificial foliage samplers placed immediately above the stream surface ranged from 37% to 99% and averaged 92%. Reductions were less clear in stable atmospheric conditions due to low wind speed and highly variable wind directions. Low wind speed conditions are not generally high-drift scenarios, but there is evidence that drift of suspended droplets beyond the barrier, comprising a small fraction of the total mass, increases in stable conditions.
Keyword Aerial application
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Paper # 071148

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Created: Sun, 06 Dec 2009, 10:00:07 EST