|Zheng, W. - UC RIVERSIDE, CA|
|Guo, M. - UC RIVERSIDE, CA|
Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: March 27, 2003
Publication Date: March 27, 2003
Citation: Papiernik, S.K., Dungan, R.S., Zheng, W., Guo, M., Yates, S.R. 2003. Reducing fumigant emissions following subsurface drip application. 225th American Chemical Society National Meeting. Abstract. New Orleans, LA. Mar. 23-27, 2003. Paper No. AGRO26. Technical Abstract: Soil fumigants are used for the control of a broad range of pests in high-cash-value crops. Their high volatility requires that management practices increase containment to reduce atmospheric emissions, increase efficacy and prevent off-site transport. Experiments were conducted to monitor emissions of fumigant compounds, including 1,3-dichloropropene (1,3-D), methyl isothiocyanate (MITC), chloropicrin, and propargyl bromide following application via subsurface drip irrigation. Experiments conducted in sand indicated that the configuration of the drip system (depth of application, emitter spacing, and single vs double drip lines) had little impact on emissions of any compound. Tarping the soil surface with standard HDPE reduced the maximum flux, but did not affect cumulative emissions. Use of impermeable plastic has the potential to drastically reduce emissions, but the film must cover the entire soil surface. In bedded systems in which only the bed was tarped with impermeable film, a large proportion of the total flux (up to 90 percent for 1,3-D) occurred from the uncovered furrows.