Fig. 2. Runoff hydrograph and ammonium N concentrations in overland flow over the irrigation event as affected by time of application of monoammonium phosphate (11–52–0) fertilizer to a mountain meadow near Gunnison, Colorado. At a given time, means followed by the same letter are not significantly different according to Bonferonni's adjusted probability level of 0.0008 (0.05/60). Mean separations were based on log-transformed data with changes in statistical difference noted by a change in letters.