Fig. 3. Microbial flush (a) C and (b) N values determined by persulfate oxidation vs. high temperature catalytic oxidation (HTCO) from fumigated and unfumigated soils. Persulfate values are averages of three separate trials (n = 6–10). Error bars represent one standard deviation. Solid lines include all data while dashed lines exclude the highest point. Total observations = 10.