Golf Course Management

SEP 2013

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

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research Turfgrass quality, 2005-2007 Cultivar 2005 2006 Summer Fall Spring Summer 5.4ab† 5.3c 5.2cd 5.6bc Catalina 5.0c 5.1cd 5.2cd 5.0cd Dawson 5.6a 6.1ab 6.1b Fults 5.0bc 4.7d Salty 5.5a 5.1cd Southeast 5.5a 5.9b Tar Heel II 5.6a 6.6a 5.4ABC 5.5A Brightstar SLT Mean Spring 2007 Fall Mean Fall Spring Summer 5.5b 5.3cd 4.5bc 4.1bc 4.5b 5.1cd 5.4b 4.8de 4.2c 4.1bc 4.4bc 4.8de 5.8ab 5.8b 5.5bc 4.7b 4.2b 4.0bc 5.3c 4.3e 4.1e 4.0d 3.9f 3.8c 3.4d 3.8c 4.1f 4.7de 4.9d 4.9c 4.4ef 4.2c 3.7cd 4.2bc 4.6e 5.5bc 5.4bc 5.8b 5.9b 5.6a 5.7a 5.6a 5.7b 7.3a 6.3a 6.8a 7.2a 5.8a 5.9a 6.0a 6.4a 5.5AB 5.3BC 5.5ABC 5.3C 4.7D 4.5E 4.7D † Lowercase letters denote differences among cultivars separately for each season (in columns); uppercase letters denote differences of the mean values among seasons during three years (in row). Values followed by the same letter are not signifcantly different from one another. Table 2. Quality (1-9, where 1 = worst and 9 = best) of seven cool-season turfgrasses during spring, summer and fall of 2005, 2006 and 2007. Data are pooled over three water qualities (potable, moderately saline and saline) and two irrigation systems (sprinkler and drip) and represent an average of 18 readings (three water qualities, two irrigation systems and three replications). Turfgrass quality under three water qualities Cultivar Water quality Potable Moderately saline Saline Brightstar LST 5.8bA † 5.4cA 3.9cB Catalina 5.7bA 4.9cB 3.8cC Dawson 5.9bA 5.1cB 5.0bB Fults 4.3d 4.2d 3.9c Salty 4.9c 4.5d 4.5b Southeast 5.7bA 6.1bA 5.2aB Tar Heel II 6.7aA 6.8aA 5.7aB Mean 5.6A 5.3A 4.6B the exception of June 2007 sampling dates, SAR in plots irrigated with moderately saline water fell between those measured in plots irrigated with saline and potable water. When SAR data were averaged over water qualities and displayed separately for each sampling date and irrigation system, sprinkler irrigation resulted in higher SAR than drip irrigation on all but the last sampling date. Moreover, changes in SAR did not follow the same seasonal peak-and-decline pattern observed for EC or sodium. Under plots that received sprinkler irrigation, SAR was highest in November 2006 and lowest in June and November 2007. In drip-irrigated plots, June and November SAR values did not differ in 2005 and 2007, but lower levels were found in November 2006 when compared to June measurements. † Lowercase letters denote differences among cultivars separately for each water quality (in columns); uppercase letters denote differences among three water qualities (in rows). Values followed by the same letter are not signifcantly different from one another. Table 3. Quality (1-9, where 1 = worst and 9 = best) of seven turfgrasses irrigated with potable, moderately saline and saline water. Data are pooled over two irrigation systems (sprinkler and drip) and values represent an average of six readings (two irrigation systems and three replications). dates, the highest EC and sodium content were measured in plots irrigated with saline water. Electrical conductivity and sodium did not differ between plots irrigated with potable and moderately saline water. SAR values. Soil SAR at soil depths of 20-24 inches mirrored the SAR of the irrigation water on each of the sampling dates. The values were highest in plots irrigated with saline water, and lowest in plots irrigated with potable water. With 82 GCM September 2013 Turf quality Turfgrasses tested in this study exhibited highest quality in 2005 and in spring and summer 2006. From fall 2006 until the end of the investigative period in 2007, overall quality declined to an average of 4.7 when data were pooled over all grasses (Table 2). During spring 2005, fve of seven grasses performed equally well, whereas at the end of the 2007 growing season, only the tall fescue cultivars Tar Heel II and Southeast exhibited highest quality ratings. Fults alkaligrass was among the grasses displaying poorest quality throughout the research period (Table 2). Effects of water quality. When data were pooled over irrigation systems and analyzed separately for three water qualities, overall turfgrass qual-

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