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Fig. 5. (a) Estimated average soil flux density, (b) measured average air concentration, and (c) measured maximum air concentration over various sampling periods. Estimated average soil flux density over daytime (Periods 1, 3, and 5) was significantly greater than that over nighttime (Periods 2 and 4). However, the average air concentration over nighttime was slightly higher than that over daytime. The measured maximum air concentration declined with time after the first night of chemigation.
