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United States Department of Agriculture

Agricultural Research Service

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1 - Column Sideflow
2 - Emission Columns
3 - Hytibar Emission Reduction
Hytibar Emission Reduction
 
 
A field experiment was conducted to study the effectiveness of a high-barrier plastic film (Hytibar) and reduced methyl bromide (MeBr) application dosages in decreasing MeBr emission from soil fumigation. Comparison was made with a conventional polyethylene film (PE) and a regular application rate. MeBr emission from nine small field plots was continuously measured with two replicated active chambers. Replicated soil cores were taken to a depth of 3 m to determine MeBr degradation and obtain a mass balance. Results indicated that about 64% of applied MeBr was lost to atmospheric emission when covered with the PE tarp. The emission was reduced to 37.5% when covered with the Hytibar tarp for 5 days. MeBr emission was virtually eliminated when covering with the Hytibar tarp for more than 10 days (only 1.1-3.2% loss). The low emission rate was verified from the degradation measurements which, along with the flux measurements produced nearly 100% mass balance. Combined use of a high-barrier plastic film such as the Hytibar with reduced application rates can significantly reduce MeBr atmospheric emission in soil fumigation.
 
References:
 
Wang, D., Yates, S.R., Ernst, F.F., Gan, J. and Jury, W.A. 1997. Reducing methyl bromide emission with a high barrier plastic film and reduced dosage. Environmental Science and Technology 31:3686-3691.

Wang, D., Yates, S.R., Ernst, F.F., Gan, J., Gao, F. and Becker, O.J. 1997. Methyl bromide emission reduction with field management practices. Environmental Science and Technology 31:3017-3022.
 
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Last Modified: 10/21/2005
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