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Irrigated Mountain Meadow Fertilizer Application Timing Effects on Overland Flow Water Quality

^a Department of Rangeland Ecosystem Science, Colorado State University, Fort Collins, CO 80523
^b Colorado State University Mountain Meadow Research Center, P.O. Box 598, Gunnison, CO 81230
^c USDA Agricultural Research Service, Rangeland Resources Research Unit, Fort Collins, CO 80526
^d Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO 80523

View larger version (22K): [in a new window]   Fig. 1. Runoff hydrograph and reactive phosphorus 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.

View larger version (22K): [in a new window]   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.