Hillsborough County Environmental Protection Commission

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  • 1. Tampa Bay Region Model Ordinance Discussions of Research Dr. Terril Nell, Director, Center for Landscape Conservation and Ecology Dr. George Hochmuth, Associate Dean for Research The IFAS Landscape Research Team

2. 3. The Model Ordinances Common Goal

  • Several groups working on solving the problem
  • Counties and municipalities
  • Statewide FDEP model ordinance
  • Statewide FDACS fertilizer rule
  • Legislature consumer fertilizer task force

4. We all agree We need culture change 5. Tampa Bay Region Draft Model Ordinance from Tampa Bay Estuary Program

  • Using science to protect the environment:
    • No P fertilizer applied without valid soil test
    • No N fertilizer within 30 days of laying sod
    • Fertilize at lowest rates recommended

6. Fertilizer-free buffer zones 7. Negligible fertilizer movement from properly applied fertilizer 8. 200 linear feet X 5 feet wide mower = 1,000 ft2 2,000 grams clippings (dry weight) 3.5% nitrogen in the clippings = 70 grams nitrogen = 0.15 lbs nitrogen 9. Do not apply fertilizer to impervious surfaces 10. Sloppy application of fertilizer

  • Even with controlled-release fertilizers
  • Even at commercial and public settings
  • Controlled-release fertilizer in crevices is a waste and contributes to storm water runoff

11. Transition image 12. Tampa Bay Region Draft Model Ordinance from Tampa Bay Estuary Program

  • An area of concern, possibly unintended consequences:
    • The Restricted Season from June 1 stto September 30 th
    • Some scientific considerations

13. Biology and ecology of turfgrass in the lawn-research results

  • Turf growth during the year
  • Root growth during the year
  • Nutrient uptake during the year

14. Warm-season turfgrass growth in the year 15. What happens to nutrients in a well-managed landscape? 16. Lysimeters buried in center of each plot 17. Total Nitrate, mg M -2 Total N Leaching in Established Floratam St. Augustinegrass 2006 18. UNINTENDED CONSEQUENCES Human nature

  • Overfertilization on the side
  • Use of stashed quick release to correct perceived problem

19. Loss of turf vigor and stand could lead toincreased leaching 20. Lower root mass in spring and fall may lead to more leaching Percentage of N Applied Leached (%) Days UAN 1/30 21. Percentage of N Applied Leached (%) 22. Irrigation management is importantfor preventing leaching and runoff 23. Our suggestions are for a flexible restricted period

  • Allow some flexibility during the restricted period to correct a diagnosed nutrition problem
  • Tissue testing
  • Soil testing
  • Small fertilizer application only under specified conditions
  • Teachable moments-change culture

24. 25. Where do we go from here?

  • We need watershed and springs friendly fertilizers
  • Focus on proper fertilization practices
  • Focus on irrigation management
  • Educate the consumer, commercial applicators, and retail establishments

26. Tampa Bay Region Model Ordinance Discussions of Research Contact Us: Dr. Terril Nell .tanell@ufl.edu Dr. GeorgeHochmuth.hoch@ufl.edu