A field estimate of SO2 deposition velocities to rapidly growing soybeans

Field-grown soybeans were exposed to elevated SO₂ levels in an open-air fumigation system which produced minimal alteration of the crop environment. The increase in S content of the fumigated plants as compared to unfumigated controls was used to estimate the deposition velocity of SO₂ to the crop. Estimates ranged from 0.5 to 0.9 cm s^?1, which is in the lower part of the range found by micrometeorological techniques, confirming that estimates based on short-term gradient measurements are realistic.