Cold Acclimation and Deacclimation in CoolSeason Grasses1
- D. B. White and
- M. H. Smithberg
Cold acclimation of turfgrasses in Minnesota, U.S.A., precedes normal environmental demand. Acclimation begins in July and August and increases steadily to a peak in January. Loss of hardiness in midwinter is at first slow, followed by a rapid loss in the March–April growth initiation period. ‘Penncross’ creeping bentgrass (Agrostis stolonifera L.) was the hardiest grass followed by Kentucky bluegrass (Poa pratensis L.), red fescue (Festuca rubra L.), and perennial ryegrass (Lolium perenne L.), which often does not tolerate Minnesota winter temperatures. Cultivars within species varied in degree of acclimation and acquisition of cold hardiness. Kentucky bluegrass cultivars ranged from −30 to −48 C, red fescue cultivars from −32 to −45 C, and perennial ryegrass cultivars from −28 to −38 C. Late fall post hardening N application did not adversely affect acquisition of cold tolerance and it enhanced spring quality and growth patterns. Cutting height did not visibly affect hardiness in Kentucky bluegrass or red fescue, but Penncross creeping bentgrass maintained at 5 cm was less hardy than when mowed at 1.5 or 0.5 cm, The critical period in overwintering coolseason grasses appeared to be primarily associated with the dehardening phase in the spring.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 1980. . Copyright © 1980 by the American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, and International Turfgrass Society, 5585 Guilford Rd., Madison, WI 53711 USA