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An open-air fumigation system for treating large field plots of crop plants with sulfur dioxide (SO/sub 2/) has been designed and tested. The fumigation system consists of an array of pipes suspended over the field plots through which SO/sub 2/ gas is released at controlled rates. The data from 2 yr experiments (three plots in 1977 and five in 1978) were examined for temporal and spatial variations in SO/sub 2/ concentrations. The SO/sub 2/ concentrations in the plots fluctuated with time due to changing wind speed and turbulence, although the SO/sub 2/ concentrations could be controlled within given ranges by adjustment of the SO/sub 2/ release rates. Statistical analysis indicated that the SO/sub 2/ concentrations (1-min averages) were neither normally nor log-normally distributed, and generally appeared to be intermediate between the two. The technique is discussed with regard to its suitability for air pollutant-crop effects studies.
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Joseph E. Miller (1980) studied this question.
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