Figure 6

Denitrification activity up to N2O + N2 (A) (acetylene) or up to N2O (B) (non-acetylene) and nitrous oxide reductase activity (Nos activity) (C) expressed by the ratio of acetylene incubation over non-acetylene incubation ((N2O + N2)/N2O) in KNO3, KNO3 + DMPP, and KNO3 + DMPSA treatments. Significant differences (p > 0.05) are indicated with different letters. Values represent the mean ± SE (n = 4).