Golf Course Management

MAY 2014

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

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78 GOLF COURSE MANAGEMENT 05.14 applied (r = −0.91), ranged from 6.4 days in Kenblue to 13.1 days in Cabernet, a dif - ference of nearly one week (Figure 2). Days to wilt was greater in Cabernet, Bedazzled, Unique and Apollo (11.9 to 13.1 days) than in the 18 bluegrasses with the least days to wilt (6.4 to 9.0 days; Kenblue through Park in Figure 2). These intervals provide the practitioner with an estimate of irrigation frequency required to maintain the various Kentucky bluegrasses at a performance level similar to this study, at least in the transition zone of the United States. In addition to re - quiring less frequent irrigation, cultivars with more days to wilt have a greater likelihood of receiving rainfall between irrigations; this could result in further water conservation and reduced irrigation costs. Notably, all cultivars in the phenotypic group Mid-Atlantic (Cabernet, Eagleton and Preakness) and four of fve in the Compact America group (Apollo, Bedazzled, King - fsher and Unique) were among the 15 cul- tivars that received the least amount of water (Table 1, Figure 1). When averaged over all cultivars within each phenotypic group, 10.75 inches (27.3 centimeters) of water was applied to Compact America types and 11 inches (27.7 centimeters) to Mid-Atlantic types [both about 0.102 inch (2.6 millime - ters)/day), which was less than the Common, Compact and Compact Midnight groups (Figure 3). The Common types received more water (15.79 inches [40.1 centimeters]; 0.149 inch [3.8 millimeters]/day]) than all other groups except Compact. Days to wilt was also greater in Mid-Atlantic and Com - pact America than in all other groups (Figure 4), indicating cultivars in Mid-Atlantic and Compact America could generally go longer without irrigation. Visual quality With the exception of the Common types in 2007, the visual quality of all bluegrasses was acceptable (>6) at the beginning of the study in each year (see the top photo, Page 76). In all bluegrasses and in both years, how - ever, visual quality declined to below what was considered minimally acceptable (bot - tom photo, Page 76). This indicates waiting until 50% wilt to apply irrigation was insuf - fcient to maintain acceptable visual quality in Kentucky bluegrass, at least for homeown - ers or superintendents who desire a moderate standard of quality in the stressful climate Kenblue Blue Knight Wellington Moonlight Baron Diva T ouchdown T Midnight II Blue Velvet NuDestiny Shamrock Award Langara Midnight Longhorn Skye Bartitia Park Thermal Blue Blaze Kingfisher Envicta Eagleton Abbey Limousine Preakness Julia Apollo Unique Bedazzled Cabernet 0 2 4 6 8 10 12 14 16 Days to wilt Figure 2. Days to wilt between irrigations among Kentucky bluegrass cultivars and hybrid bluegrasses, averaged over the periods June 19-Oct. 1, 2007 (105 days), and June 22-Oct. 7, 2009 (108 days), at Manhattan, Kan. Bedazzled Apollo Cabernet Unique Preakness Abbey Julia Envicta Limousine Bartitia Kingfisher Eagleton Thermal Blue Blaze Midnight Skye Award Langara Longhorn Park NuDestiny BlueVelvet Shamrock Touchdown Midnight II Diva Baron Moonlight Wellington Blue Knight Kenblue 0 5 10 15 20 25 Water applied (inches) Figure 1. Water applied to Kentucky bluegrass (KBG) cultivars and hybrid bluegrasses, averaged over the periods June 19-Oct. 1, 2007 (105 days), and June 22-Oct. 7, 2009 (108 days), at Manhattan, Kan. Error bars denote standard error. Water applied to KBG and hybrid bluegrass cultivars Days to wilt for KBG and hybrid bluegrass cultivars 076-087_May14_TechwellCuttingEdge.indd 78 4/16/14 2:53 PM

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