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Fig. 3. Influence of slurry dry matter (DM) content (Experiment 2) on (a) crust thickness, (b) ammonia emission rate (g NH3–N m–2 d–1), and (c) normalized emission rate (% initial total ammoniacal nitrogen [TANi] m–2 d–1). Error bars indicate ±1 standard error of the mean (n = 4).