. Elementary lessons in the physics of agriculture. Agricultural physics. 130 which can only be secured by forcing the soil aside. There is gre:^t danger of puddling the soil in the use of the subsoil plow, because the surface may appear dry enough to work when the subsoil is too wet. Fig. 62. 203. The Harrow.— As implements of tillage, harrows are used to secure several quite distinct ends: 1. To produce a shallow seed-bed. 2. To dry the soil preparatory to seeding. 3. To render the surface of the ground more even. 4. To pulverize the soil and secure a more even texture. 5. To co
. Elementary lessons in the physics of agriculture. Agricultural physics. 130 which can only be secured by forcing the soil aside. There is gre:^t danger of puddling the soil in the use of the subsoil plow, because the surface may appear dry enough to work when the subsoil is too wet. Fig. 62. 203. The Harrow.— As implements of tillage, harrows are used to secure several quite distinct ends: 1. To produce a shallow seed-bed. 2. To dry the soil preparatory to seeding. 3. To render the surface of the ground more even. 4. To pulverize the soil and secure a more even texture. 5. To cover seed. 6. To destroy young weeds. 7. To work manure into the surface soil. 8. To aerate the soil. 9. To check evaporation by developing a soil mulch. According as one or another of these ends is to be secured, uhe character of the harrow should be different. In Figs. 63, G-i and 65 are represented three of the strongly marked types of harrows. 204. The Disc Harrow.— This harrow, Fig. 63, is dis- tmctly a seed-bed-preparing and soil-drying tool and, in its adjustable ty])es, may be made to work to a remarkable depth in fall plowing and in corn ground in the spring. An immense. 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 King, F. H. (Franklin Hiram), 1848-1911. [Madison, Wis. ] The author
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