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TURFGRASS SCIENCE

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

* Corresponding author (jeerick1{at}students.wisc.edu)

Turfgrass landscapes have the potential for loss of applied N through both runoff and leaching. Lower maintenance alternative vegetation used in mixed-species landscapes may reduce N leaching and runoff, which is important for reducing N pollution of surface and ground waters. However, few studies have examined this paradigm. Therefore, we constructed a field-scale facility to compare fertilizer N runoff and leaching between St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze] and a mixed-species landscape. Four replications of each landscape were randomly assigned to 50-m² plots. A medium-fine sand (75-cm depth) was used as the root zone mix. A blended granular fertilizer was applied at a rate of 300 and 150 kg N ha^-1 yr^-1 on the turfgrass and mixed-species, respectively. Throughout the first year following installation of the landscapes, fertilizer N loss in surface runoff was insignificant. In contrast, N leaching losses were significantly greater on the mixed-species landscape during three fertilizer cycles, resulting in 48.3 kg N ha^-1 compared with 4.1 kg N ha^-1 for the St. Augustinegrass annually. The results from the newly established landscapes presented here indicated that St. Augustinegrass was more efficient at using applied N and minimizing N leaching compared with the alternative landscape. Furthermore, the study identified areas of concern with respect to N management practices on alternative landscapes. These results hold implications for future landscape models and management of resources in a residential setting.

Abbreviations: ET, Evapotranspiration • FYN, Florida Yards and Neighborhoods

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