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Comparing Nitrogen Runoff and Leaching between Newly Established St. Augustinegrass Turf and an Alternative Residential Landscape

^a Forest Ecology and Management, Univ. of Wisconsin, 1630 Linden Dr., Madison, WI 53706
^b Environmental Horticulture, Fort Lauderdale Research and Education Center, 3205 College Ave, Fort Lauderdale, FL 33314
^c Environmental Sciences, Florida Atlantic University, 2912 College Ave., Davie, FL 33314
^d Soil and Water Science, Everglades Research and Education Center, P.O. Box 8003, Belle Glade, FL 33430

View larger version (22K): [in a new window]   Fig. 1. Rainfall and irrigation inputs (mm mo-1). Irrigation was measured by a flow meter in the main irrigation line. Approximately 9% more irrigation was applied to the St. Augustinegrass plots.

View larger version (26K): [in a new window]   Fig. 2. Mean daily movement of percolate water (mm d-1) over time (n = 4). Dotted vertical lines represent data cycles corresponding with fertilization dates on the mixed-species landscape. The effect of rainfall on percolate volume can be seen during the wet season with little variation between the treatments following the first cycle.

View larger version (33K): [in a new window]   Fig. 3. Mean daily inorganic N leached (kg ha-1) over time (n = 4). Dotted vertical lines represent fertilization events for both treatments while solid vertical lines represent additional St. Augustinegrass fertilizations. Increases in N leaching following fertilization were generally seen on both treatments, but to a lesser magnitude on the St. Augustinegrass.