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United States Department of Agriculture

Agricultural Research Service

Research Project: Development of Improved Methods to Predict Emissions of Pesticides and Soil Fumigants in Semi-Arid Regions Project Number: 2036-12130-009-05
Project Type: Specific Cooperative Agreement

Start Date: Aug 25, 2011
End Date: Aug 24, 2016

Objective:
(a) To determine the impact of vapor sorption on pesticide volatilization from variably saturated soil. Determine the affect of heat transport and energy/mass exchanges at the soil surface on pesticide volatilization. (b) Develop the capability to predict the effects of soil heating and changes in soil moisture content on vapor sorption and on the fate and transport of volatile pesticides and soil fumigants. (c) Relate this information to agronomic production systems and the protection of atmospheric resources.

Approach:
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.

Last Modified: 12/19/2014
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