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Project Status: complete

Title: Study of abatement methods and meteorological conditions for optimum dispersion of particulates from field burning of rice straw: spring open field burning trials.

Principal Investigator / Author(s): Goss, John R. and Miller, George E. Jr.

Contractor: UC Davis

Contract Number: 1-101-1

Research Program Area: Atmospheric Processes

Topic Areas: Agriculture


This project was initiated to obtain information on the effect of meteorological conditions and management techniques on particulate emissions from spring open field burning of rice field residue. Two fire management practices were employed: single line backfire, and single line headfire. Three residue management techniques were studied: spread straw, windrowed straw, and raked spread straw. In addition, measurements were taken of air temperature, relative humidity, absolute humidity, wind speed and direction, residue moisture content, residue loading (Kg/m2), fire temperature, rate of flame spread, CO2 emission, particulate production and particulate size distribution. The data analysis showed that particulate emissions could be minimized by burning at low moisture contents and using a backfire instead of a headfire ignition technique. Laboratory simulations confirmed the advantages of low residue moisture and backfiring in reducing particulate emissions.

The laboratory tests also showed that increased fuel loading (Kg/m2) may help to decrease particulate emissions. Laboratory and field data showed that the particulate emissions were generally of a submicron size and a significant amount of the particulates were chloroform-soluble organic compounds. Studies were conducted with several large open field burns where the practicality of selected fire and residue management techniques were tested. The estimated costs per acre of the various techniques were confirmed in the large open field burns.

This report was submitted in fulfillment of ARB Project No. 1-101-1 and ARB 2113 by the University of California at Davis. (Principal Investigators: John Goss and George Miller) under the partial sponsorship of the California Air Resources Board - work was completed as of June 30, 1973.

The statements and conclusions in this report are those of the contractor and not necessarily those of the California Air Resources Board. The mention of commercial products, their source or their connection with material reported herein is not to be construed as either an actual or implied endorsement of such products.


For questions regarding this research project, including available data and progress status, contact: Heather Choi at (916) 322-3893

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