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Fig. 2. Mean distribution of ¹⁵N among soil and plant pools 6 d after application as either NH₄ or NO₃ at the Konza Prairie, Kansas, in August 1994. Error bars are the standard deviation of four replicates. Bars for the same N pool accompanied by the same letter do not differ significantly among combinations of burning and N source treatments (p $≤$ 0.10).