Start Date: Aug 25, 2011
End Date: Aug 24, 2016
Conduct laboratory, field and modeling research as needed to develop a data set that can be used to predict pesticide emissions as affected by soil drying and heat transport. Conduct laboratory experiments to investigate the effect of soil water content and soil temperature on emissions of volatile pesticides and soil fumigants under highly controlled conditions. These experiments will obtain information on degradation, adsorption, soil diffusion and volatilization. Utilize the experimental results to design a field experiment to study pesticide volatilization under typical agricultural conditions. Conduct experiments to measure needed soil physical properties, evaporation, and heat transfer to characterize the moisture status of soils and relate to changes in vapor sorption. Determine the effect soil moisture has on near-surface exchange processes. Test, and develop when necessary, a model to enable prediction of pesticide volatilization as the soil moisture content varies from saturated to very dry conditions. Develop, as needed, relationships between soil moisture content and sorption of volatile organic chemicals on soil particles.