Fig. 5. Representative example of the relationship between (a) the NO-N flux and NO-N concentration and (b) the NO2–N flux and NO2–N concentration just after the chamber was closed. Measurements were made between 21 June 1998 and 30 Apr. 1999. The treatment was poultry manure (PM). Solid line: regression (a) y = -0.149x + 0.974, R2 = 0.62, p < 0.01; (b) y = -0.29x + 0.087, R2 = 0.560, p < 0.01.