Golf Course Management

AUG 2019

Golf Course Management magazine is dedicated to advancing the golf course superintendent profession and helping GCSAA members achieve career success.

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08.19 GOLF COURSE MANAGEMENT 67 cause the turf canopy may obscure the soil (Figure 2). On rare occasions, stains can be observed on the actual turfgrass and may be misdiagnosed as a sign of disease (Figure 3). e ramifications of these observations are concerning because granular iron sulfate may be the iron source most commonly ap - plied to turfgrass. is form of iron is soluble and is commonly blended in bulk fertilizer. us, it seems reasonable to assume that granular iron sulfate will solubilize, enter the soil solution, be taken up by the turf via root absorption and result in increased turf greening. However, the 14 studies conducted at the University of Florida simply did not show a response to granular iron sulfate. In those same studies, however, turfgrass plots treated with foliar-applied iron sulfate showed enhanced greening of the turfgrass foliage. ese differing responses lead one to ask, "Is it a waste of time and money to include iron in granular fertilizer blends?" Because turf responded to the same iron source when it was applied to the leaves but not to the soil, the answer was likely a function of soil solu - bility. erefore, a comprehensive soil-solubil- ity study was conducted using common iron products available in the turf market. e ob - jective was to determine the solubility of these iron fertilizers when they were applied to 11 soils collected from across the United States. Materials and methods Incubation study An incubation study was carried out to Figure 3. Iron stains occurring on the turf canopy can be misdiagnosed as disease.

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