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TURFGRASS SCIENCE

Atmospheric Composition under Impermeable Winter Golf Green Protections

^a Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, 2560 Hochelaga Boulevard, Ste-Foy, Québec, Canada, G1V 2J3
^b Royal Canadian Golf Association, Golf House, 1333 Dorval Drive Suite 1, Oakville, Ontario, Canada, L6M 4X7; Département de phytologie, Université Laval, Sainte-Foy, Québec, Canada, G1K 7P4
^c Centre de recherche en horticulture, Département de phytologie, Université Laval, Sainte-Foy, Québec, Canada, G1K 7P4

^* Corresponding author (rochettep{at}agr.gc.ca)

The utilization of impermeable winter covers on annual bluegrass [Poa annua var. reptans (Hauskn.) Timm.] golf greens as a protection against excess water and ice is increasing rapidly in Canada and elsewhere in northern climates. A study was conducted to examine the impact of these covers on the atmospheric composition over golf green turfgrass during the 1997–1998 and 1998–1999 winters in Québec City and in Montréal, Canada. Winter protective covers tested included a commercial impermeable cover on top of either curled wood shavings mat (CW-CC), 15 cm of straw mulch (SM-CC) or a felt material (FM-CC), a clear polyethylene cover on top of a curled wood shavings mat (CW-PC), and an unprotected control. Oxygen was consumed at variable rates under impermeable winter protective covers. As a result, anoxic conditions were not reached during winter at the Québec City site but high respiration rates at the Montréal site resulted in anoxic conditions that lasted for periods as long as 50 d, without apparent damage to the annual bluegrass plants. Further tests were conducted on greens experiencing recurrent damages that could not be explained by freezing temperatures, snow mold pathogens, excess water, or ice. We showed that these problem greens had higher soil respiration rates than nonproblem greens indicating that the differences in O₂ consumption amongst golf greens are likely due to differences in soil biological activity rather than in plant respiration. We also established that the higher activity in soils of recurrently damaged greens was related to higher levels of soil organic C. Accordingly, sand-based golf greens built according to the USGA specifications had lower soil organic matter and lower respiration rates than greens built on native soils. We conclude that high rates of O₂ consumption by golf greens with high soil organic matter content results in potentially harmful anoxic conditions under impermeable covers during winter.

Abbreviations: CC, commercial impermeable cover • CTL, unprotected control • CW, curled wood shavings • DAT, days after treatment • FM, felt material • PC, polyethylene cover • SM, straw mulch