Golf Course Management

MAY 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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66 GOLF COURSE MANAGEMENT 05.19 lations colonizing creeping bentgrass putting greens. M.S. thesis, Virginia Polytechnic Institute and State University, Blacksburg, Va. Kurt Hockemeyer is turfgrass diagnostic lab manager in the Department of Plant Pathology at the University of Wisconsin, Madison, Wis. Chase Straw is a post-doctoral Effects of iron sulfate on dollar spot severity in Minnesota Treatment Rate/1,000 square feet Water volume/1,000 square feet Dollar spot severity † Aug. 14 1 Non-treated control 111.8 a Iron sulfate, 7-day application interval 2 3 ounces 0.75 gallon 19.5 d-g 3 3 ounces 1.5 gallons 15.5 efg 4 3 ounces 3.0 gallons 20.0 d-g 5 6 ounces 0.75 gallon 3.5 fg 6 6 ounces 1.5 gallons 4.8 fg 7 6 ounces 3.0 gallons 8.8 fg 8 12 ounces 0.75 gallon 1.0 g 9 12 ounces 1.5 gallons 0.3 g 10 12 ounces 3.0 gallons 0.3 g Iron sulfate, 14-day application interval 11 3 ounces 0.75 gallon 58.8 bc 12 3 ounces 1.5 gallons 58.0 bc 13 3 ounces 3.0 gallons 68.8 b 14 6 ounces 0.75 gallon 37.5 cde 15 6 ounces 1.5 gallons 44.5 bcd 16 6 ounces 3.0 gallons 27.8 def 17 12 ounces 0.75 gallon 25.0 d-g 18 12 ounces 1.5 gallons 13.3 efg 19 12 ounces 3.0 gallons 25.0 d-g † Means in the same column followed by the same letter are not significantly different. Table 2. At the Minnesota site, iron sulfate was applied to putting greens at three different application rates and two application intervals. The volume of water for tank-mixing was 0.75 gallon, 1.5 gallons or 3.0 gallons/1,000 square feet (305.6, 611.2 or 1,222.4 liters/hectare). 3 ounces/1,000 square feet = 9.2 kilograms/hectare, 6 ounces/1,000 square feet = 18.3 kilograms/hectare, and 12 ounces/1,000 square feet = 36.6 kilograms/hectare. research associate, and Brian Horgan is a professor and Extension turfgrass horticulturist in the Department of Horticultural Science at the University of Minnesota, St. Paul, Minn. Doug Soldat is a professor in the Department of Soil Science, and Paul Koch ( is an assistant professor in the Department of Plant Pathology at the University of Wisconsin, Madison, Wis. (report) Modeling vertical water distribution and surfactant degradation in sand-based turf systems Michael Carlson Mark Keck Bill Kreuser, Ph.D. Surfactants (wetting agents) are frequently applied to sand-based turfgrass systems. Re - search at the University of Georgia, Univer- sity of Arkansas, University of Wisconsin and New Mexico State University has demon - strated the importance of surfactant applica- tions on sand-based turf for over two decades. Benefits include increased infiltration rate, re - duced localized dry spot, improved water re- tention or drying (depending on the degree of saturation), and lower wilting points. Many of these research studies have also looked at the horizontal distribution of water with portable time-domain reflectometry (TDR) soil mois - Golf course superintendents often use wetting agents (also known as surfactants) to relieve symptoms of hydrophobic soil. Photos by Bill Kreuser

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