Abstract
Daily germination counts were made on 11 forage grass species germinated at four constant and four alternating regimes for 20 days. The 2C/12h/13C/12h regime had a drastic effect on mean total germination. Altai wild ryegrass (Elymus angustus Trin.), Russian wild ryegrass (E. junceus Fisch.), reed canary grass (Phalaris arundinacea L.), and bromegrass (Bromus inermis Leyss.) reacted strongly to this regime. The alternating temperature regimes generally initiated germination more rapidly than the comparable constant regimes; however, after day 6 the comparable alternating and constant regimes had similar rates of germination. The rates of germination differed between some species with intermediate wheatgrass (Agropyron intermedium (Host.) Beauv.) germinating the most rapidly and Altai wild ryegrass the most slowly. The data indicate that low alternating seedbed temperatures can reduce total germination to an unsatisfactory level for good stand establishment. The low temperature of seedbeds can also delay germination rate so that the earlier plantings do not emerge as soon as later plantings in warmer soil.
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