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 71 • Previous tests of iron products on turf- grass found that turf treated with granular iron showed no response, but greening occurred when turfgrass received foliar applications of the same iron source. • Ten iron products were tested on 11 soils from areas across the U.S.; each product was derived from a different iron source, and all are available in the turf market. • Non-chelated iron became insoluble in each soil one hour after soil contact. • EDTA, DTPA and EDDHA increased soluble iron in the soils, and the influence of chelation was more apparent in soils with pH greater than 7.0. The RESEARCH SAYS Acknowledgments e authors thank Kaitlyn M. Schoonover and Kathryn M. Shaddox for their assistance in the collection of soils from Colorado and Oklahoma. Literature cited 1. Lindsay, W.L., and A.P. Schwab. 1982. The chemistry of iron in soils and its availability to plants. Journal of Plant Nutrition 5:821-840. doi: 10.1080/01904168209363012 2. Shaddox, T.W., H. Fu, D.S. Gardner, R.M. Goss, E.A. Guertal, W.C. Kreuser, G.L. Miller, B.R. Stew - art, K. Tang and J.B. Unruh. 2019. Solubility of ten iron fertilizers in eleven North American soils. Agronomy Journal 111:1498–1505. doi: 10.2134/ agronj2018.12.0770 3. Taiz, L., E. Zeiger, I.M. Møller and A.S. Murphy. 2015. Plant physiology and development. Sixth edi - tion. Sinauer Associates, Sunderland, Mass. Travis Shaddox ( is an assistant profes- sor at the University of Kentucky, Lexington, Ky. Hanzhuo Fu is a laboratory manager at the University of Florida's Fort Lauderdale Research and Education Center, Fort Lau - derdale, Fla. David Gardener is a professor at Ohio State University, Columbus, Ohio. Ryan Goss is an associate professor at New Mexico State University, Las Cruces, N.M. Elizabeth Guertal is a professor at Auburn Univer - sity, Auburn, Ala. William Kreuser is an assistant professor at the University of Nebraska, Lincoln, Neb. Grady Miller is a professor at North Carolina State University, Raleigh, N.C. Barry Stewart is an associate professor at Mississippi State University, Starkville, Miss. Kaiyuan Tang is a gradu - ate student and research assistant at Pennsylvania State University, State College, Pa. J. Bryan Unruh is a professor and associate center director at the University of Florida, Jay, Fla. Figure 5. The ability of chelates to maintain soluble iron in the soil is influenced by soil pH. This figure is modified from a previously published graph (1). pH % of chelate with iron 100 80 60 40 20 4 5 6 7 8 9 10 EDTA EDDHA DTPA

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