Project Number: 5302-13220-004-29
Project Type: Trust

Start Date: Aug 01, 2010
End Date: Jul 31, 2012

Objective:
1) Determine emission reductions by the TIF from fumigation in deep-rooted orchard soils. 2) Determine reduced fumigant application rates that still achieve sufficiently high fumigant concentration and uniform distribution in soils for ensuring good efficacy from broadcast injection under the TIF tarp. 3) Determine the proper waiting period between fumigation and tarp-cutting by evaluating fumigant degradation rates in orchard representative soil types, temperature and soil moisture conditions in the San Joaquin Valley.

Approach:
Two field trials and laboratory experiments are planned to achieve the study objectives during a two year period. A field trial will be conducted to determine emission reduction and soil-gas fumigant concentration/distribution at full and reduced rates under TIF tarp in deep-rooted orchard soils. A standard PE film will be used as a comparison. Alternatives to MeBr will be used such as Telone C35 or Telone II. A second trial in the 2nd year will test either for a different alternative fumigant product (e.g., methyl iodide if registered in CA) or a different orchard soil to repeat the 1st year’s treatments to verify findings depending on the 1st year’s data. Laboratory incubation experiments will be conducted simultaneously to determine the degradation or dissipation rate of fumigants in soil that assist in determining proper waiting period for TIF tarp-cutting to avoid a surge of emissions.