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Effect of nitrate and ammonium fertilization on in situ fluxes of N2O from palsa peat soil within 3 h following fertilization (see Materials and Methods for details). Mean values and standard errors of four replicates are shown for unfertilized controls (C) and for treatments fertilized with a solution of 20 mM NaNO3 (N) or 20 mM NH4Cl (A).
