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 EC, sodium and SAR, 2005-2007 A Moderately saline Saline Electrical conductivity (decisiemens/meter) Potable A A A A A B A A B B B C B B B B Results B A Sodium (ppm) A B A B A A A B C C C B B B B B B A Sodium adsorption ration (SAR) A A B A A B A B B B C B November 2006 June 2006 November 2005 June 2005 B June 2007 C C Root-zone salinity at depths of 0 to 8 inches When data were pooled over both sampling depths and irrigation systems, soil salinity, sodium content and SAR values exhibited a peakand-decline pattern during 2005 and 2006. Peaks in June refected salt accumulation from March to June from irrigation and minimal natural precipitation, and declines in salinity values in late summer and early fall were due to leaching of salts from the root zone as a result of the rainy season (Figure 1). A similar trend was observed for EC in plots that were irrigated with potable water (Figure 1) and plots irrigated with saline water between June and November 2007. Over the three-year research period, root-zone salinity was at its highest in June 2006, with EC values reaching 4.8 decisiemens/meter; sodium, 1,247 ppm; and SAR, 20.7. Salinity values did not change between November 2006 and November 2007 on plots irrigated with potable or moderately saline water. Salinity values within the root zone generally refected the values of the irrigation water, with highest values measured in plots irrigated with saline water and lowest values in plots irrigated with potable water (Figure 1). The EC values did not differ between plots irrigated with moderately saline water and those irrigated with potable water on four of six sampling dates. High November 2007 B C 0.5 inch (1.27 centimeters) operated at 30 psi. Irrigation water use on subsurface-drip-irrigated blocks was recorded with water meters (Invensys Process Systems), and run times were calculated based on recorded water delivery rates. Uniform water distribution on subsurface drip-irrigated blocks was monitored three times over each growing season. Soil moisture values were subsequently analyzed for distribution uniformity, similar to distribution uniformity calculations on sprinklerirrigated blocks. Figure 1. Electrical conductivity (EC), sodium content and sodium adsorption ratio (SAR) in soil at depths of 0-8 inches irrigated with potable, moderately saline or saline water. Data are pooled over two irrigation systems (subsurface drip and sprinkler) and two depths (0-4 inches and 4-8 inches). Letters denote the differences in EC, sodium and SAR among the three water qualities separately for each sampling date. Installation of the subsurface drip irrigation system at the research site. 78 GCM September 2013

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