1a.Objectives (from AD-416)
To develop efficient and cost-effective field management practices to minimize emissions of methyl bromide alternative fumigants from pre-plant soil fumigation while achieving effective pest control.
1b.Approach (from AD-416)
Field management methods that have potential to reduce fumigant emissions and improve efficacy will be tested. Methods including fumigant application (new shank design, and drip. vs. shank application), low permeable tarps, irrigation, and soil amendment with organics as well as combination of these methods will be determined for their effectiveness and feasibility. Field trials will be conducted in air-quality non-attainment areas in California including Ventura County and the San Joaquin Valley. Data on emission rates, total emission losses, distribution of fumigants in soil profile and efficacy on soil pest control will be collected. Monitored data will be summarized to identify good and effective practices that can be adopted in growers’ fields. Documents SCA with UC Davis.
The agreement was established in support of Objective 3 of the in-house project. Under this agreement, collaborative research has been conducted to develop agricultural practices to reduce emissions of soil fumigants. One large field trial was conducted in strawberry fields in the fall of 2009 in Ventura County and compared to standard polyethylene tarp and totally impermeable film (TIF) tarp on emission reduction and fumigant concentration change under the tarp as well as distribution in the soil profile. Emission was monitored with both aerodynamic modeling and flux chamber methods. This field trial will provide regulatory agencies with the data/information regarding the use of adoption of the film in reducing fumigant emissions. This project is monitored by regular site visits and regular conference calls between the ADODR and the University investigators on this project.