| Autor: |
Richard Karsky, Harold W Thistle, George Ice |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
2007 Minneapolis, Minnesota, June 17-20, 2007. |
| DOI: |
10.13031/2013.23364 |
| Popis: |
A field study was conducted west of Corvallis, Oregon in the Coastal Range to evaluate the effectiveness of riparian barriers, as defined by the Oregon Forest Practice Act rules, in preventing herbicide deposition to streams. A helicopter sprayed two tracers (BSF and LiCl) over 4 transects (two each into a Medium Stream and a Small Stream barrier). Twenty trials were conducted resulting in over 1400 tracer samples. The preliminary conclusion of this study is that riparian barriers as currently defined in Oregon are effective at reducing the amount of deposition to streams. The effect is strongest when the potential for near field drift driven by wind speed is greatest with reductions shown here ranging from 58 to 96% of the fine droplet (driftable) fraction when compared to modeled controls. The reduction is less clear under low wind speed conditions but these conditions are not generally high drift scenarios and absolute deposition to downwind streams is low in these scenarios in any case. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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