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Fig. 1. (a) Cumulative loss of NH3 during the period of 14 Mar. to 12 Apr. 2002 following application of 200 kg ha–1 urea-N to midrotation pines as affected by application of 0, 4, and 11 mm of simulated rain on Day 4 following urea application. (b) Cumulative loss of NH3 during the period of 2 to 31 May 2002 following application of 200 kg ha–1 urea-N to midrotation pines as affected by application of 0 and 40 mm of simulated rain on Day 5 following urea application. (c) Cumulative loss of NH3 during the period of 9 Aug. to 7 Sept. 2002 following application of 200 kg ha–1 urea-N to midrotation pines as affected by application of 24 mm of simulated rain to either a bare soil or a normal forest floor the same day as the urea is applied or on Day 7 to a normal forest floor following urea application (bars are standard errors).
