. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. ng needles, a small scalpel, a pair of forceps, a handlens magnifjdng 16 diameters, a small chemical balance, a small graduatedcylinder holding about 100 cubic centimeters, a dinner plate, a smallbell jar, and several mats made by sewing squares of blotting paper be-tween two pieces of canton flannel. Practical Seed Testing There are four fundamental points to be considered in practical seedtesting. They are: AGRICULTURAL SEEDS, SELECTION AND TESTING 261 •I. Whether the seeds b
. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. ng needles, a small scalpel, a pair of forceps, a handlens magnifjdng 16 diameters, a small chemical balance, a small graduatedcylinder holding about 100 cubic centimeters, a dinner plate, a smallbell jar, and several mats made by sewing squares of blotting paper be-tween two pieces of canton flannel. Practical Seed Testing There are four fundamental points to be considered in practical seedtesting. They are: AGRICULTURAL SEEDS, SELECTION AND TESTING 261 •I. Whether the seeds belong to the species which it is desired to plant. 2. Whether the sample is free from dehberate adulterations and fromnoxious weed seeds and other noxious impurities, 3. Whether the sample possesses a high percentage of viable seeds andhigh vital energy, as shown by the rapidity with which germinationtakes place. 4. Whether they are of at least average volume-weight. In determining the first point, whether the seeds belong to the specieswhich it is desired to plant, a selected sample is spread out upon a piece. Fig. 112.—Mixture of weed seeds commonly found in low-grade alsike clover seed:a. alsike clover; b, white clover; c, red clover; d, yellow trefoil; e, Canada thistle; /,dock; g, sorrel; h, buckhorn; /, rat-tail plantain; k, lambs quarters; I, shepherds-purse;m, mayweed; n, scentless camomile; i, white campion; p, night-flowering catch-fly;q, oxeye daisy; r, small-fruited false flax; s, cinquefoil; /, peppergrass; it,catnip; v, timothy; x, chickweed; y, Canada bluegrass; z, clover dodder; i, mouse-earchickweed; 2, knot-grass; 3, tumbling amaranth; 4, rough amaranth; 5, heal-all; 6,ladys-thumb. (Enlarged.) {After Hillman, F. H.: The Adulteration of Forage-PlantSeeds. Farmers Bulletin 382, 1909, p. 10.) of white paper and the seeds gone over one by one (Fig. 112). All foreignseeds, if any are present, are removed and later weighed. The percentageobtained by
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Keywords: ., book, bookcentury1900, bookdecade1920, booksubjectpoisonousplants
