. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 24.—Sudan grass seeds, enlarged. Unhulled seeds, spikelets (1); hulled grains (2): a, a, Seed stem; 6, 6, construction at the junction of seed and stem; c, c, appendages of the seed with broken apexes; d, scar of the grain; e, embryo. The contrasting characters of the two seeds, as described by Hill- man, are set forth in Table XIX. It will be noticed that there is an overlapping in several of these characters, particularly in the size and color of the unhulled seeds; also that a small percentage of Sudan grass se
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 24.—Sudan grass seeds, enlarged. Unhulled seeds, spikelets (1); hulled grains (2): a, a, Seed stem; 6, 6, construction at the junction of seed and stem; c, c, appendages of the seed with broken apexes; d, scar of the grain; e, embryo. The contrasting characters of the two seeds, as described by Hill- man, are set forth in Table XIX. It will be noticed that there is an overlapping in several of these characters, particularly in the size and color of the unhulled seeds; also that a small percentage of Sudan grass seeds has no the rachis adhering and an equally small per- centage of Johnson grass seeds is found in which a portion of the rachis adheres. In all such cases, however, Hill- man declares that an examination of the seed surface at the point of attachment, the size of the seed, together with the size, form, and color of the grain, should suffice to distinguish the seed of one grass from that of the other. Most States now have seed laboratories in connec- tion with their agricultural experiment stations. By referring sam- ples of all Sudan grass seed importations to the analysts in these laboratories the seed dealer may ascertain whether these samples are free from Johnson grass seed. CULTURAL METHODS FOR SEED PRODUCTION. Most Sudan grass seed is produced in cultivated rows, because this method of planting with its accompanying cultivation more nearly assures a crop, especially in regions subject to drought. Table XX shows the yields obtained in both wide and narrow rows, as compared with broadcast or close drills. Table XX shows that cultivated rows give bet- ter yields of seed in the humid regions and also in the semiarid regions if the crop is not irrigated. Un- der irrigation the results are reversed, the broadcasted or close-drilled seedings being markedly superior. Narrow rows, 18 to 24 inches apart, give larger yields than the wide rows, 36 to 44 inches apart, b
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