. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. 96 CIVIC BIOLOGY tearing off half the roots of the corn plants for centuries, and laboriously reducing the yields from 30 to 50 or more l)ushels per acre, some one hit upon the idea of studying — applying '' cultivated thouglit •' to the roots of the single corn plant. It was discovered that many of them spread out near the surface, live, six, or even seven feet in every direction. Next came the thought. May not too deep cultivating hi jure these roots ? The experiment has now been
. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. 96 CIVIC BIOLOGY tearing off half the roots of the corn plants for centuries, and laboriously reducing the yields from 30 to 50 or more l)ushels per acre, some one hit upon the idea of studying — applying '' cultivated thouglit •' to the roots of the single corn plant. It was discovered that many of them spread out near the surface, live, six, or even seven feet in every direction. Next came the thought. May not too deep cultivating hi jure these roots ? The experiment has now been tried of shaving the weeds without stirring the soil at all, applying careful. Fig. 48. l^vo plots of,corn on peaty swamp land Lfft, fertilized with phospliorus (not needed): erop. 0. Right, fertilized Avith potassium: erop, 72 bushels per acre. Seed, cost of fertilizer. ;uid lal)or on the two plots about equal. Photograph by Cyril G. Hopkins shallow tillage to comparable rows in the same fields. Results have shown, on the average, equal yields from the uncultivated rows. Figure out, for your farm, township, county, state, or for the United States, how manv dollars' Avorth of labor this one discovery may save annually. Pure-bred selected strains. Again, we have learned that l)y breedhig and selection of productive strains the crop may be increased without additional labor. This fact gives the added value to pure-bred stock in animals and plants. Half the plants in an ordinary field of potatoes or corn may l)e ''loafers"; half the trees in an ordinary orchard may be '' resters " ; half the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hodge, Clifton Fremont, 1859-; Dawson, Jean, 1873-. Boston, Ginn
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