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Short-Term Competition for Ammonium and Nitrate in Tallgrass Prairie

^a USDA-ARS-PSWMRU, University Park, PA 16802
^b Department of Agronomy, 2004 Throckmorton Hall, Kansas State University, Manhattan, KS 66506

View larger version (31K): [in a new window]   Fig. 1. Mean distribution of 15N among soil and plant pools 6 d after application as either NH4 or NO3 at the Konza Prairie, Kansas, in June 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).

View larger version (28K): [in a new window]   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).