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Influence of Water Temperature on Submersion Tolerance of Four Grasses¹

Mature sods of ‘Toronto’ creeping bentgrass (Agrostis palustris Huds.), ‘Merion’ Kentucky bluegrass (Poa pratensis L.), annual bluegrass (P. annua L.) and ‘Pennlawn’ red rescue (Festuca rubra L.) were submergedin constant temperature water tanks at water temperatures of 10, 20, and 30 C. Three replications of each species were removed at designated intervals, drained, and placed in a greenhouse maintained at 20 C for evaluation of survival. Differentials in turfgrass species tolerance to extended periods of submersion were evident with Toronto creeping bentgrass showing superior tolerance, Merion Kentucky bluegrass and annual bluegrass ranking intermediate, and Pennlawn red rescue being quite intolerant. The duration of submersion tolerance was inversely proportional to the water temperature. Symptoms of injury at 30 C were visible on the intolerant species at the time of removal from the water tank and after 3 to 4 days on the tolerant species. There was a rapid loss of chlorophyll followed by general plant deterioration. Death occurred initially at the leaf tips of older leaves followed by a brownish discoloration of the leaf sheath.

Key Words: Creeping bentgrass • Kentucky bluegrass • Annual bluegrass • Red fescue

² Associate Professor and Graduate Assistant respectively, Department of Crop and Soil Sciences, Michigan State University, E. Lansing, Mich. 48823.

Received for publication August 26, 1969.

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