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Urban Water Qualitv and Fertilizer Ordinances:Avoidina Unintended Conseauences:A Review.... 9 <br /> current(2011)N recommendations for turf limit a shows that leaching was dependent on fertilizer rates <br /> single application to 1.0 lb per 1000 sq ft.of N under and turfgrass type(Trenholm et al.,2011).Leaching <br /> the FDACS'Fertilizer Rule(FDACS,2007). was greater from zoysiagmss than from St. <br /> Therefore,under a summer fertilizer ban the turfgrass Augustinegrass(Trenholm et al.,2011).Similar <br /> manager will be limited to this 1.0 lb application for results for these two species were found in a North <br /> the entire 4-month summer growing period.Studies Carolina study by Bowman et al.(2002),and <br /> are underway to determine if there are fertilizer leaching was greater just after planting than after the <br /> materials that will maintain healthy turf for this establishment phase.In well-established and <br /> 4-month period when applied at the recommended maintained St.Augustinegrass turf,inorganic N <br /> rate at the beginning of the period. leaching was lower with concentrations of NH4 N <br /> Seasonal shoot and root growth of warm-season turfgrasses.(Turgeon 2002) <br /> t.4.�►�.+t ate` .�+' <br /> •" it.4 } <br /> M't�� <br /> Winter Spring Summer Fall <br /> e 30 <br /> s 25 <br /> m <br /> -t 20 <br /> m <br /> a 15 <br /> a <br /> Z 10 <br /> 0 <br /> m <br /> °f 5 <br /> c <br /> m <br /> m <br /> 0 <br /> a May June July Aug Sept Oct <br /> Figure 1.Diagrammatic(textbook)presentation of growth of warm-season turfgrass(top drawing)and actual N leaching <br /> during season(bottom figure-after Sartain,2010). <br /> The UF/IFAS Extension fertilizer and NO3-Nin drainage generally less than that <br /> recommendations for turfgrass,summarized by reported for rain water in southern Florida.This <br /> Sartain(2007),emphasize applications of experiment was conducted over a three-year period <br /> slow-release(controlled-release)N in the summer. encompassing wet and dry season cycles that bracket <br /> The use of controlled-release fertilizer in the summer proposed black-out periods when the turf was <br /> helps minimize the losses of N because only very fertilized at 1 lb N/1000 sq.ft.bimonthly with a <br /> small amounts of N are released from the fertilizer at 620/o/38%soluble/controlled-release commercially <br /> any one time(typically based on temperature and available fertilizer(Erickson et al.,2008). <br /> moisture).These release schedules are in relationship <br /> with the plant growth rate.Recent research in Florida <br /> �3-l� <br />