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Germination of Grass Seed as Influenced by Storage Condition¹

Normal and hulled seed of six cool-season grasses were stored for 10 years under three storage conditions. Normal seeds of intermediate wheatgrass [Agropyron intermedium (Host) Beauv.], tall oatgrass (Arrhenatherum elatius L. Presl.), meadow foxtail (Alopecurus pratensis L.), and timothy (Phleum pratense L.) were not reduced in germination when stored for 10 years at 5 C and 40% relative humidity (cold-dry). Orchardgrass (Dactylis glomerata L.) and smooth bromegrass (Bromus inermis Leyss.) lost 5 and 17% germination under this storage condition. Warm-dry and cool-moist storage reduced the germination of normal seed of meadow foxtail by 2 and 6% and timothy by 11 and 19%, respectively. These less favorable storage conditions greatly reduced germination of the other four species. Hulled seed of Orchardgrass and tall oatgrass maintained high germination after 10 years of storage when stored under cold-dry conditions.

Key Words: Hulled seed • Temperature • Humidity

² Research Agronomist, Plant Science Research Division, Agricultural Research Service, US Department of Agriculture, Pullman, Wash.

Received for publication June 24, 1971.