Golf Course Management

JUN 2019

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Page 72 of 139

06.19 GOLF COURSE MANAGEMENT 71 • Using TE and Revolution alone or in combination allowed turf quality to be maintained under reduced irrigation. • Applying the plant growth regulator and the soil surfactant in a tank mix produced better turf quality than applying the prod- ucts individually, but individual application also produced acceptable turf quality. • Applying Revolution alone did not increase volumetric water content, but the com- bination of the surfactant and the plant growth regulator increased volumetric water content in plots irrigated at 50% ETos in 2015 and in plots irrigated at 65% ETos throughout the study. The RESEARCH SAYS grass quality can be maintained with 15% to 30% less irrigation water than the optimal rate (80% ETos) by using a surfactant, a plant growth regulator, or both. Overall, during the hottest period of the year (June-September), the application of Revolution + trinexapac- ethyl resulted in turf quality and color that was equal to or superior to that obtained when each chemical was applied separately. When compared with the control, plots treated with Revolution + trinexapac-ethyl rated higher in quality on 13 of the 18 sampling dates and rated higher in color on 14 of the 18 dates. When products were applied alone, Revolu - tion resulted in greater turf quality 11 times, and trinexapac-ethyl produced better turf quality 13 times. Plots that received both Rev- olution and trinexapac-ethyl ranked higher in turfgrass quality than all other treatments on two occasions at 65% ETos and on one occa- sion at 50% ETos. ‰e combination of Revolution and trinexapac-ethyl was more effective at increas- ing volumetric water content than each chem- ical applied separately, but all treatment com- binations had similar effects on soil moisture uniformity. It appears that the combined ef- fect of Revolution, which improves soil mois- ture conditions, and trinexapac-ethyl, which enhances stress tolerance through improved photosynthetic activity, provides optimal re- sults in bermudagrass under deficit irrigation. ‰e question is whether the cost of applying both products will prevent their use. Although rigorous water restrictions are in effect in many communities, the available budget may preclude the use of such products. Funding Financial support of the study was pro- vided by Aquatrols Corp., the New Mexico State University's Agricultural Experiment Station, Southwest Turfgrass Association, Syngenta AG and the United States Golf As- sociation. We are also grateful for donations from Helena Chemical Co., and we appreciate the help of Karl Olson and John Kimmel, golf course superintendents at New Mexico State University's golf course. Acknowledgments ‰e information in this article was origi- nally published as "Combining trinexa- pac-ethyl with a soil surfactant reduces bermudagrass irrigation requirements" by M. Serena, M. Sportelli, E. Sevostianova, R. Sal- lenave and B. Leinauer in Agronomy Journal 110:2180-2188 (2018). Literature cited 1. Hanna, W., P. Raymer and B. Schwartz. 2013. Warm- season grasses: Biology and breeding. In : J.C. Stier, P.B. Horgan and S.A. Bonos, eds. Turfgrass: Biology, use, and management. Madison, Wis. 2. Kostka, S.J. 2000. Amelioration of water repel- lency in highly managed soils and the enhancement of turfgrass performance through the systematic application of surfactants. Journal of Hydrol- ogy 231-232:359-368. doi:10.1016/S0022- 1694(00)00208-0 3. Leinauer B., and D.A. Devitt. 2013. Irrigation science and technology. Pages 1075-1131. In : Stier, J.C., P.B. Horgan, and S.A. Bonos, eds. Turfgrass: Biology, use, and management. Madison, Wis. 4. Leinauer, B., E. Sevostianova, M. Serena, M. Schia- von and S. Macolino. 2010. Conservation of irriga- tion water for urban lawn areas. Acta Horticulturae 881:487-492. 5. Schiavon, M., B. Leinauer, M. Serena, B. Maier and R. Sallenave. 2014. Plant growth regulator and soil surfactants' effects on saline and deficit irrigated warm-season grasses: I. Turf quality and soil mois- ture. Crop Science 54:2815–2826. doi:10.2135/ cropsci2013.10.0707 Matteo Serena ( and Elena Sevosti- anova are research assistant professors in the Department of Plant and Environmental Sciences at New Mexico State University, Las Cruces, N.M. Mino Sportelli is a doctoral student at Universita degli Studi di Pisa Dipartimento di Scienze Agrarie Alimentari e Agro-ambientali, Diparti- mento di Scienze Agrarie, Pisa, Toscana, Italy. Rossana Sallenave is a professor in the Department of Extension Animal Sciences and Natural Resources, and Bernd Lein- auer is a professor in the Extension Plant Sciences Depart- ment at New Mexico State University, Las Cruces, N.M.

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