TABLE 2.

Inhibition of nitrification in Searsville Lake soil during incubations with various levels of added DFM or MeF^a

Inhibitor added (kPa)	Amt of NH4+ consumedb (μmol g−1)	Amt of NO3− + NO2− producedc (μmol g−1)
None	13.1 ± 0.2	5.7 ± 0.3
DFM (0.01)	6.3 ± 0.5	1.5 ± 0.2
DFM (0.03)	2.9 ± 0.1	0.3 ± 0.2
DFM (0.05)	2.8 ± 0.1	0.4 ± 0.2
DFM (1.0)	2.6 ± 0.3	−0.3 ± 0.2d
MeF (2.0)	2.6 ± 0.7	−0.3 ± 0.1d

^a 15-day incubations of 5 g of soil with 40 μmol of added NH₄Cl g⁻¹. 

^b Mean ± 1 standard deviation (n = 3), calculated as the amount added minus the amount measured, corrected for soil background (1.5 μmol g⁻¹); the heat-killed control (n = 1) did not consume NH₄⁺. 

^c Mean ± 1 standard deviation (n = 3), corrected for soil background (1.4 μmol g⁻¹); the heat-killed control (n = 1) did not produce NO₃⁻ + NO₂⁻. 

^d Less NO₃⁻ + NO₂⁻ recovered than in the soil background.