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6 2-6•1� <br /> 10. A N . <br /> General Recommendations for Fertilization of Turfgrasses on Florida Soils 4 <br /> The advantages and disadvantages of organic or growth which follows N fertilization. Usually, iron <br /> chemical fertilizers relate to the consumer, not the sulfate(2 ounces per 3 to 5 gallons of water per 1000 <br /> turfgrass. Inorganic N fertilizers have advantages and square feet)or a chelated iron source are used to <br /> disadvantages as listed in Table 2. provide this greening effect. The effect from <br /> supplemental iron application is only temporary <br /> Table 2.Advantages and disadvantages of inorganic (approximately 2 to 4 weeks),therefore, repeat <br /> nitrogen fertilizer sources. <br /> applications are necessary for summer-long color. <br /> Inorganic Nitrogen Sources <br /> Advantages Disadvantages Precautions <br /> Reaffly'avatllak*N " <br /> Low cost per pound of N Danger of fertilizer All soluble fertilizers may burn the turfgrass if <br /> burn improperly applied. To avoid burn, never apply <br /> Easily controled N levels High saru*- Ion fertilizer at greater than the recommended rate of 0.5 <br /> Little problem of residual Must be applied pounds of soluble N per 1000 square foot per <br /> N frequently at low rates application. If only slow-release N materials are used <br /> up to 3 pounds of N can be applied in a single <br /> application. Apply P and K only when required based <br /> on a recent soil test and do not exceed the <br /> Organic N fertilizers also have advantages and recommended rate of application, especially for P. <br /> disadvantages that are listed in Table 3. Select a N Always apply fertilizers when the turfgrass leaves are <br /> source after considering the pros and cons of the dry and water thoroughly after application. Apply • <br /> various forms. A mixture of the two will most likely enough water to dissolve the fertilizer and move it <br /> result in the best response. below the surface. This can generally be <br /> Table 3.Advantages and disadvantages of organic nitrogen accomplished by applying between 1/4 and 1/2 inch <br /> fertilizer sources. of water through the irrigation system which can <br /> usually be accomplished by running a typical <br /> Organic Nitrogen Sources turfgrass irrigation system for 15 to 20 minutes. <br /> Advantages Disadvantages Excess irrigation may leach the soluble N below the <br /> Of N <br /> root zone so great care should be taken not to water <br /> viw 6t Pt <br /> Less subject to leaching Not released at adequate <br /> too little or too much. <br /> loss rate during cool season <br /> uta own <br /> May be applied May contain weed seeds <br /> infrequently at high rates that contaminate turfgrass <br /> Supplemental Iron Application <br /> Many times turfgrasses, such as Centipedegrass, <br /> Bahiagrass and St. Augustinegrass,turn yellow <br /> during the summer due to lack of N fertilizer. <br /> However, fertilization with N in the summer is not <br /> always desirable since this often encourages disease <br /> and insect problems. Many times the addition of iron <br /> (Fe)to these grasses provides the desirable dark <br /> green color, but does not stimulate excessive grass <br /> 59 s- 3 <br />