. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. hy generally produces between fiveand twelve bushels of seed per acre. The grass is most conveniently cutwith the self-binder and is threshed with the ordinary threshing machine,using special sieves to clean the seed. Timothy hay contains about6 per cent, protein, 45 per cent, of carbohydrates, per cent, of fat and29 per cent, of crude fiber, of these substances about half are digestible. Kentucky Blue Grass, June Grass {Poa pratensis).—This useful grassis perennial with an
. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. hy generally produces between fiveand twelve bushels of seed per acre. The grass is most conveniently cutwith the self-binder and is threshed with the ordinary threshing machine,using special sieves to clean the seed. Timothy hay contains about6 per cent, protein, 45 per cent, of carbohydrates, per cent, of fat and29 per cent, of crude fiber, of these substances about half are digestible. Kentucky Blue Grass, June Grass {Poa pratensis).—This useful grassis perennial with an extensively creeping rhizome, which produces leafystems in bunches at intervals along its length. The stem of blue grassgrows from 18 inches to 23^^ feet tall. The basal leaves are longer than 134 PASTORAL AND AGRICULTURAL BOTANY the upper stem leaves. The panicle is pyramidal with its slender remotebranches with 3 to 5 fascicles. The spikelets are crowded, 3-5 lemmas are cobwebby at the base (Fig. 55). This is a common grassin meadows and fields throughout the United States and in British Colum-. FiG. 55.—Kentucky blue grass {Poa pratensis.) (After Ball, Carleion R.: Winter ForageCrops for the South, Farmers Bulletin 147, 1902, p. 19.) bia. It is naturalized in the east, but is indigenous in the north and gets its name Kentucky blue grass, because it thrives in the hmestonesoils of certain districts of Kentucky, which on this account are cele-brated for their fine ])reeds of horses and cattle. DESCRIPTION OF IMPORTANT GRASS FORAGE PLANTS 135 Adaptability.—This grass and its congener the Canadian blue grass{Poa compressa) (Fig. 56) are adapted to a cool, moist climate with 30 in-ches of rainfall and upward. They are resistant to cold, never freezingout in zero weather. They prefer well-drained loams, or clay loams some-
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