Thesis
Effect of soil application method on surface emission rates of methyl isothiocyanate
Washington State University
Master of Science (MS), Washington State University
2010
Handle:
https://hdl.handle.net/2376/103558
Abstract
An agronomic field-scale air monitoring study was conducted in eastern Washington State in the fall of 2008 to estimate surface volatilization of methyl isothiocyanate (MITC) following concurrent low drift center pivot chemigation (drizzle boom) and soil-incorporated shank injection applications of metam sodium. The aim of this project was to side-by-side compare MITC off-gassing under application rates and climatic conditions typical for cooler fall Pacific Northwest pre-plant potato fumigation. A second aim of this work was to provide relevant MITC emission rate data for these putative emission-reducing application practices to aid in human health risk assessments in setting conservatively protective field-edge set-back distances from treated fields. The results indicated that MITC near-field emissions are appreciably reduced by shank injection compared to center pivot fumigation even with adoption of irrigation system modifications that reduce physical drift. This study suggests that surface volatilization will continue to be a major factor in MITC off-target movement and that adoption of shank injection near areas of residential development should be encouraged to mitigate emissions as much as possible.
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Details
- Title
- Effect of soil application method on surface emission rates of methyl isothiocyanate
- Creators
- Matthew Henry Littke
- Contributors
- Vincent R. Hebert (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Environment, School of the (CAHNRS)
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525376101842
- Language
- English
- Resource Type
- Thesis