Emissions management projects focused on reducing non-target emissions of fumigant alternatives to MB. Preplant
soil fumigants are usually injected or incorporated below the soil surface and move laterally and vertically through the soil profile via gas phase diffusion. After application, soil fumigants are subject to dissipation processes including chemical and microbial degradation to non-toxic metabolites, partitioning into soil organic matter or clay particles, and “off-gassing” or emission to the atmosphere.
Both the rate and total amount of non-target fumigant emission can impact bystanders and the environment, and therefore both factors drive decisions and regulations about how and when MB and alternative soil fumigants may be applied. The emission projects in the Pacific Area-wide Program for Integrated Methyl Bromide Alternatives used two broad approaches, plot-scale and field-scale experiments, to address fumigant emission concerns.
Photos: Fumigant Emissions Projects
Heating unit added to prevent water condensation inside the electronic box for temperature drops below dew point at night time. Photo by Suduan Gao
Top view of an electronic box of a dynamic flux chamber system. Photo by Suduan Gao
An overview of a field trial using dynamic flux chambers to measure emission from several surface seal treatments. Photo by Suduan Gao
Fumigant application by TriCal in a large field trial. Photo by Suduan Gao
Emission monitoring in an 8-acre fumigated field in Lost Hills, 2011. Photo by Suduan Gao.
Soil gas sampling probes installed in the field and sampling from different depths. Photo by Suduan Gao
A field view of fumigant application rate and efficacy field trial conducted in Parlier, CA. Photo by Suduan Gao
Fumigation trial, Parlier CA. Two tarps, different fumigation rates, measurements of emissions, soil fumigants, efficacy investigations. Photo by Gao
An overview of a field trial with dynamic flux chamber installed to sample emissions. Photo by Suduan Gao
Fumigant injection and soil disking and rolling in a fumigation trial. Photo by Suduan Gao
Irrigation to produce a water seal for reducing emissions. Photo by Suduan Gao
Tarp application by TriCal to a field plot in a field trial. Photo by Suduan Gao
Tarp application by TriCal to a field plot in a field trial. Photo by Suduan Gao
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