Fig. 4. (A) Fluxes of N2O-N from perennial ryegrass; (B) average soil temperature at 5 cm among plots and air temperature at 2 m; and (C) average soil water filled porosity (WFP) at 5 cm among plots. Daily averages are presented for WFP and 7-d averages for soil and air temperatures. Vertical dashed lines represent fertilization dates. Symbols plus (+) along the abscissa in (A) indicate significant differences (P < 0.05) between one and the other 2 treatments.