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Urban Water Qualitv and Fertilizer Ordinances:Avoiding Unintended Conseauences:A Review.... 13 10 Pensacola 10 Tallahassee 10 Jacksonville 8 8 - 8 - 6 6 6 4 4 4 - 0 0 0 R JFMAMJJASOND JFMAMJJASOND JFMAMJJASOND 10 Tampa 10 Orlando 10 Melbourne 8 8 - 8 - 6 6 6 4 4 4 o o . .t JFMAMJ JA SO NO JFMAMJJASOND JFMAMJJASOND 10 Fort Myers 10 Key West 10 Miami 8 8 8 6 6 6 4 4 -� 4 0 , . 0 0 JFMAMJJASOND JFMAMJJASOND JFMAMJJASOND Figure 3.Mean monthly rainfall totals(inches)at select stations across Florida from 1971-2000(CLIM20,2004). Issue W. How might rainfall patterns and applications during the summer result in less leaching amounts affect fertilizer nutrient leaching than applications at other times of the year(Trenhohn and runoff before, during,or after the et al.,2011). summer growth period? Potential for fertilizer leaching and runoff Florida receives more rain than nearly all other increase when the soil becomes saturated following a states,but the rain sometimes falls in large amounts heavy rain or several successive heavy rains.The over short periods(Purdum,2007).Erosion may World Meteorological Society and National Weather occur where soils are on slopes and where Service have established a two-inch rainfall as a groundcover is poor.Florida may receive significant "heavy rain"—when soil saturation is most likely to rainfall at any time of the year but particularly in the occur for most soils in Florida.However,there are summer months from thunderstorms or tropical several factors that affect how fast the soil will systems(Figure 3).There are times in the year when become saturated leading to leaching or runoff heavy rainfall occurs before and after the summer (Brady and Weil,2002;Zotarelli et al.,2010).These period(Figure 3).As recommended in the UF/IFAS factors include the soil texture,natural soil bulk Florida-Friendly Landscaping Program,fertilizer density,compaction,and how much of the 3 - ZC?