Laurie E. Trenholm

Professor at University of Florida

2015 North Jefferson Street, Jacksonville, Florida, United States
University of Florida
HQ Phone:
(904) 588-1800
Wrong Laurie Trenholm?

Last Updated 10/18/2015

General Information

Employment History

Environmental Horticulture Department  - University of Florida's Institute of Food and Agriculture Sciences

Turf-Grass Specialist  - UF

Associate Professor, Turfgrass Specialist, Department  - Environmental


PhD  - University of Florida/IFAS

Web References  


Ms. Laurie Trenholm, a professor of Environmental Horticulture at the University of Florida, stated that she was the lead researcher on the FDEP nutrient study which was conducted in three locations statewide over a period of about 11 years and pointed out that the primary focus of that study was nitrogen.
She commented that she could unequivocally state that grass in a healthy actively growing turf will take up the majority or all of the nitrogen fertilizer applied to it, and the root system was at its deepest and most massive during the growing season. She suggested that any blackout period be during the winter months, since they tended to see the highest rates of nitrate leaching from January through March throughout the state. She also related that she did not recommend that people apply fertilizer to newly planted sod for 30 to 60 days until the root system was established, since that is a time of extremely high amounts of nitrate leaching. She commented that she would support the current model ordinance and that she agreed that education is extremely important, noting that the extension agents in Lake County do a great job training people in the statewide best management practices program for the green industry. She emphasized that those in the industry who apply fertilizer commercially are required to be certified in those best management practices. Ms. Trenholm answered that she believed that was not in the original ordinance but was in the modified ordinance. Ms. Trenholm responded that much of the soil in Florida is very sandy with no ability to provide nutrients, and a larger setback to the waterbodies could lead to some soil erosion.

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EMPIRE Zoysia is challenging St. Augustine - Empire Turf

Zoysia is susceptible to disease and insects like other grasses, said Laurie Trenholm, a University of Florida assistant professor in environmental horticulture.
"It's not a miracle grass," Trenholm said. "The advantages that I see in Zoysia is that it holds its green color well, and you can use less nitrogen on it," Trenholm said.

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Florida Horticultural Fact Sheets

L.E. Trenholm, J. Bryan Unruh, and J.L. Cisar
2. L.E. Trenholm, Assistant Professor, Turfgrass Specialist, Department of Environmental Horticulture, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611, J. Bryan Unruh, Assistant Professor, Turfgrass Specialist, West Florida Research and Education Center, Institute of Food and Agricultural Sciences, Jay, FL 32565, J.L. Cisar, Professor, Turf Specialist, Ft. Lauderdale Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Ft. Lauderdale, FL 33314.

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