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 Potable water Sprinkler Visual quality Drip Moderately saline A Visual quality A B B Saline Discussion A B Summer 2006 Fall 2007 Summer 2007 Spring 2007 Fall 2006 Fall 2005 Summer 2005 Spring 2005 Visual quality B Spring 2006 A Figure 4. Visual quality of cool-season turfgrasses during spring, summer and fall in 2005, 2006 and 2007, irrigated with potable, moderately saline or saline water. Data are pooled over nine cultivars. Letters denote the differences in quality between the two irrigation systems separately for each sampling date. 84 GCM September 2013 ity was lowest under saline irrigation and highest under irrigation with potable and moderately saline water (Table 3). Four grasses, Tar Heel II, Fults, Salty and Brightstar SLT, exhibited the same quality under potable and moderately saline water, while the performance of Catalina and Dawson was affected by moderately saline irrigation water. Turf quality of Catalina declined further with increasing salinity in the irrigation water (Table 3). Salinity did not affect performance of Salty or Fults, but both grasses rated lowest in quality for each of the three water qualities (Table 3). Tar Heel II averaged a rating of 6.7 for quality under irrigation with potable water, followed by Dawson (5.9), Brightstar SLT (5.8), Catalina (5.7) and Southeast (5.7) (Table 3). Fults, averaging 4.3, displayed the poorest visual quality under irrigation with potable water. Tar Heel II (5.7) and Southeast (5.2) had the highest quality under saline irrigation during the investigative period. Brightstar SLT, Catalina and Fults exhibited poorest quality under saline irrigation. Effects of irrigation system. Type of irrigation system had no infuence on turfgrass quality on plots irrigated with potable water or on those irrigated with moderately saline or saline water for most dates (Figure 4). Plots irrigated from a drip system with moderately saline water rated lower in quality in summer and fall 2007, and plots that were drip-irrigated with saline water exhibited lower quality in spring and summer 2006 (Figure 4). Irrigating cool-season turfgrasses with saline waters in a climate with limited rainfall necessitates adding a leaching fraction to the required irrigation amount to prevent detrimental levels of salt accumulation (3). In this study, we irrigated at 120% ET and relied on natural precipitation during the rainy season (June-September) to manage salinity in the top 8 inches of the root zone. Generally, changes in soil EC, sodium content and SAR refected seasonal changes in irrigation and natural precipitation. Higher values for EC, sodium content and SAR were measured in summer 2005 and 2006 before the onset of the monsoon season. These peak salinity levels were followed by lower values in the fall, after the rainy season, which typically begins in early July and continues into early fall (Figure 1). These fndings are in agreement with results of other researchers (5), who demonstrated successful salt leaching in a desert Arizonan soil with the help of monsoon rains. These fndings are also similar to results

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