Golf Course Management

NOV 2012

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 to the study. The research area measured approximately 246 feet × 65.6 feet (75 meters × 20 meters) and plot size was 20 feet × 20 feet (6 meters × 6 meters). Each treatment was replicated three times. Water treatments and turf maintenance Treatments consisted of two types of irrigation water and several water-conditioning products. Plots were irrigated with either potable water (elec- trical conductivity [EC] = 0.6 deciSiemens/meter, Sodium Adsorption Ratio [SAR] = 1.55) or saline water (EC = 3.1 deciSiemens/meter, SAR = 8.94) pumped from a saline aquifer near the research site. Saline irrigation water was classified as very high in salinity and medium for sodium hazard (7). Conditioning treatments included two catalytic water conditioners, Zeta-Core (Zeta-Core USA Inc., Corrales, N.M.) and Fre-Flo (Fre-Flo Water Systems Inc., Santa Monica, Calif.); a magnetic water conditioner, Magnawet (Magnawet Corp., Indianapolis, Ind.); and a control treatment. In February 2007, a hydroelectrical treatment unit, Aqua-PhyD (Aqua-PhyD Inc., Irvine, Calif.), was added to the project. Physical water-treatment devices were mounted into the water supply lines, and irrigation was regulated separately for each water-quality and conditioning unit. Overhead irrigation was applied by Walla Walla MP2000 Rotators (Walla Walla Sprinkler Company, Walla Walla, Wash.) operated at 30 psi (200 kPa), with one pop-up streaming rotor installed in each corner of a plot. Irrigation audits were conducted during each of the growing sea- sons to ensure distribution uniformity was never lower than 0.7 and to provide data necessary to schedule irrigation run times. Water meters were used to record irrigation water use separately for each conditioning unit and for each water quality (saline or potable). Irri- gation amounts were calculated every Monday morning based on the previous week's cumulative ETo rate, and plots received a daily equivalent of one-seventh of the total weekly ETo. Turf maintenance The perennial ryegrass (Lolium perenne L.) cultivar IG2 was seeded on Jan. 20, 2005, and on March 13, 2007, at a rate of 6 pounds/(1,000 square feet) (30 grams/square meter). On Oct. 10, 2006, the entire study area was sprayed with glyphosate herbicide to remove any existing vegetation so that a second establishment experiment could be conducted. The entire area also was irrigated with potable water from Novem- ber 2006 to March 2007 to leach salts that had A photo of the study site in October 2006 after the first establishment period and the second growing season. The research study site was located at New Mexico State University's golf course, where both potable and saline water were available for irrigation. The photo shows the construction of the irrigation system for the research project. November 2012 GCM 91

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