Hillsborough County Environmental Protection Commission
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Transcript of Hillsborough County Environmental Protection Commission
![Page 1: Hillsborough County Environmental Protection Commission](https://reader035.fdocuments.us/reader035/viewer/2022081404/55960b8e1a28abfc7b8b47fa/html5/thumbnails/1.jpg)
Tampa Bay Region Model OrdinanceDiscussions of Research
Dr. Terril Nell, Director, Center for Landscape Conservation and EcologyDr. George Hochmuth, Associate Dean for Research
The IFAS Landscape Research Team
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The Model OrdinancesCommon Goal Several groups working on solving the
problem Counties and municipalities Statewide FDEP model ordinance Statewide FDACS fertilizer rule Legislature consumer fertilizer task force
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We all agree………We need culture change
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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
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Fertilizer-free buffer zones
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Negligible fertilizer movement from properly applied fertilizer
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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
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Do not apply fertilizer to impervious surfaces
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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
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Transition image
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Tampa Bay Region Draft Model Ordinance from Tampa Bay Estuary Program
An area of concern, possibly unintended consequences : The Restricted Season from June 1st to September 30th
Some scientific considerations
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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
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Warm-season turfgrass growth in the year
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What happens to nutrients in a well-managed landscape?
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Lysimeters buried in center of each plot
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4/4 4/18 5/2 5/16 5/30 6/13 6/27 7/11 7/25 8/8 8/22 9/5 9/19 10/3 10/17 10/31
1 lb N 1.75 lb N
Tot
al N
itra
te, m
g M
-2
Total N Leaching inEstablished Floratam St. Augustinegrass 2006
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UNINTENDED CONSEQUENCESHuman nature
Overfertilization ‘on the side” Use of stashed quick release to correct perceived problem
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Loss of turf vigor and stand could lead to increased leaching
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Lower root mass in spring and fall may lead to more leaching
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May June July Aug Sept OctPerc
enta
ge o
f N
App
lied
Lea
ched
(%
)
Days
UAN 1/30
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Per
cent
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of N
App
lied
Lea
ched
(%
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May June July Aug Sept Oct
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Irrigation management is important for preventing leaching and runoff
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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
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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
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Tampa Bay Region Model OrdinanceDiscussions of Research
Contact Us:Dr. Terril Nell …[email protected]. George Hochmuth…[email protected]