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4 3. General Recommendations for Fertilization of Turfgrasses on Florida Soils SL 21 http://edis.ifas.ufl.edI/pdffiles/LWLHO1400 pdf P 4: "Many times turfgrasses, such as Centipedegrass,Bahiagrass and St. Augustinegrass,turn yellow during the summer due to lack of N fertilizer. However,fertilization with N in the summer is not always desirable since this often encourages disease and insect problems. Many times the addition of iron(Fe)to these grasses provides the desirable dark green color,but does not stimulate excessive grass growth which follows N fertilization." 4. Frequently Asked Questions about Florida-Friendly Landscaping ENH 1113 Jan 2009 http://edis.ifas.ufl.edu/WQ144 P2: Question 3: What are the best ways to prevent water pollution? Bullet#5 "Apply an iron source instead of additional fertilizer in the summer to keep grass green without increasing growth." 5. The Florida Lawn Handbook,authors Laurie E.Trenholm and J.Bryan Unruh, is not available online, however copies can either be ordered from University Press of Florida or accessed at a local county extension office. The Florida Lawn Handbook details the growing season(months when fertilization is recommended) for the Central Region that includes February,March,April,May, October and November; all outside of the summer rainy season. 6. On January 15, 2013 OF-IFAS faculty presented research results that actually confirm the successful experience with rainy season bans. A"Blackout Test"(Cisar)showed that turf,growing in the region between Orlando to South Florida, can withstand the four months of summer fertilizer-free without any meaningful decline in health. A separate study's results(Sartain)confirmed that the use of quality,higher percentage slow release fertilizer means that turf continues to be fed long after the last application prior to the beginning of summer. The link to these research results is: http://publicfiles.dep.state.fl.us/DEAR/nonpoint/WM869%20DATA/WM869%2OCompleted%2OStu dies%20Report%20May 1 2012.pdf Please especially see pages 76-91. Excerpt from page 76: However, UPCU1 provided more consistent turf quality relative to urea, which induced higher ratings immediately following applications but had lower quality in the last quarter of several cycles. Based on these data for a 6-month period of time, under urban fertilizer restrictions, UPCU1 may offer a legitimate alternative to frequent urea applications. Excerpts from page 77: More importantly,both yield and turf quality did not differ significantly(P>0.95)between UPCU2 and urea in the latter stage of each 120-d cycle(Table 55 and 56), indicating a good overall agronomic performance. 5gs- L �