The periodicity of germination in some grass species

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Abstract
Periodicity of germination was studied in 26 species of grasses. Considerable variation from species to species was found in rapidity of germination, seasonal periodicity of germination, and length of time during which seed remained viable in the soil. The following are examples of species showing: (a) no dormancy–Hordeum murinum and Echinochloa crus-galli var. frumentacea; (b) some dormancy—Festuca rubra var. commutata and Bromus mollis; and (c) definite dormancy—Agrostis temnuis and Glyceria fluitans. The results are discussed from the viewpoints of: (a) control of weed grasses; and (b) contamination of seed crops by buried viable seeds.