Golf Course Management

MAR 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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80 GOLF COURSE MANAGEMENT 03.19 were fertilized with 21.76 pounds N/acre on May 5, June 10 and Sept. 26, using a 19-0-15 (N-P-K) granular fertilizer (Andersons Golf Products). Nitrogen was applied as a foliar spray weekly between June 9 and Aug. 29, using a 28-0-0 (N-P-K) liquid fertilizer at a rate of 4.37 pounds N/acre. Granular treat - ments were applied and irrigated with 0.15 inch (3.8 mm) of water to avoid fertilizer burn. Fungicides were applied preventively and curatively to avoid turfgrass loss. Experimental treatments e surfactant (Revolution, Aquatrols) was applied as a foliar spray to Penn A-4 creeping bentgrass and annual bluegrass field plots at the recommended label rate of 2 gallons/acre (18.5 liters/hectare). e soil surfactant was applied monthly from May through October in 2013 and 2014. e spray application vol - ume was 10.35 gallons/acre (96.9 liters/hec - tare) applied with a CO 2 backpack sprayer. Soil volumetric water content An aerial view of the experimental field shows the treatment plots. Small plots with white outlines indicate the areas treated with or without the surfactant. Photos courtesy of Emily Merewitz 30 25 20 15 10 5 0 30 25 20 15 10 5 0 30 25 20 15 10 5 0 30 25 20 15 10 5 0 Soil volumetric water content (%) Soil volumetric water content (%) June 1 July 1 Aug. 1 Sept. 1 Oct. 1 2014 2013 June 1 July 1 Aug. 1 Sept. 1 Oct. 1 A B C D Revolution + 8% Revolution + 12% Revolution + 16% Control + 8% Control + 12% Control + 16% Figure 1. Soil volumetric water content at a depth of 1.5 inches (3.8 cm) under 8%, 12% and 16% target soil volumetric water content for controls or turf treated with soil surfactant within (A) creeping bentgrass, 2013; (B) creeping bentgrass, 2014; (C) annual bluegrass, 2013; and (D) annual bluegrass, 2014. Least significant difference bars are present on dates in which significant differences were detected among treatments.

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