Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 132 row it can be used to cut sod but bas a greater tendency to drag them out of place. 206. The Tooth Harrows.—These tools, in theu- great variety of forms, are best adapted to secure the ends 3 to 9 named in 203. The heavier ty|)es are, however, fair drying tools, especially on the more mellow soils, and in such situa- tions, too, they give a sufficiently deep seed-bed for most of the small To kill weeds, when just emerging from the ground, in potato and corn fields,
Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 132 row it can be used to cut sod but bas a greater tendency to drag them out of place. 206. The Tooth Harrows.—These tools, in theu- great variety of forms, are best adapted to secure the ends 3 to 9 named in 203. The heavier ty|)es are, however, fair drying tools, especially on the more mellow soils, and in such situa- tions, too, they give a sufficiently deep seed-bed for most of the small To kill weeds, when just emerging from the ground, in potato and corn fields, and in developing a light Fig. 65. mulch to retard evaporation from the soil, there is no tool more effective or rapid in its execution than the light, many- toothed harrows. 207. Cultivators.— We have much to learn yet in regard to the real objects to be secured by summer tillage or cuilt- vation. Three chief objects appear to control present practice; they are: 1. To kill weeds. 2. To lessen surface evaporation. 3. To cover the roots of plants more deeply. I believe we shall find, however, that one of the most im- portant functions is 4. To secure better soil aeration. When we remember that good aeration, plenty of moisture, and a warm temperature are among the essentials both to soil nitrification and root-growth, and that nature's ways of soil aeration are decidedly interfered with by our methods of tillage, it seems but natural that some equivalent should be supplied by our manner of working soil. If soil aeration is conducive to its fertility it would appear
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