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Fig. 3. Cumulative loss of NH₃ during a 31-d laboratory study from 200 kg ha^–1 urea N, in which 20 mm of simulated rain was applied to a forest floor (packed into acrylic plastic cylinders) at different times with respect to the urea application. Diurnal cycles of temperature (15 to 25°C) and relative humidity (40 to 95%) mimicked the natural cycle (bars are standard errors).