Soils and fertilizers . onsisting of a balance, a set of weights and a 100 gradu-ated cylinder. Exercise VIII. — Calculation of pore space. Materials. — Data from Exercise VII. Procedure. — Using as the absolute specific gravity of soilsand the data from the preceding exercise, calculate the pore spaceon loose and compact clay and sand respectively by means of thefollowing formula. % pore space ^ Labs. sp. gr. 1 J Be ready to explain the reasons and significance of the resultsobtained. Ap. sp. gr. means apparent specific gravity. Abs. sp. gr. means absolutespecific gravity. E 50 SOILS
Soils and fertilizers . onsisting of a balance, a set of weights and a 100 gradu-ated cylinder. Exercise VIII. — Calculation of pore space. Materials. — Data from Exercise VII. Procedure. — Using as the absolute specific gravity of soilsand the data from the preceding exercise, calculate the pore spaceon loose and compact clay and sand respectively by means of thefollowing formula. % pore space ^ Labs. sp. gr. 1 J Be ready to explain the reasons and significance of the resultsobtained. Ap. sp. gr. means apparent specific gravity. Abs. sp. gr. means absolutespecific gravity. E 50 SOILS AND FERTILIZERS Exercise IX. — A study of the plow. Material. — Garden plow and team. Procedure. — Study the plow by following the diagram in Fig. the mold board, point, share, landside, shin, heel beam,coulter and clevis. Adjust the plow to various widths and depths of furrow slice,trjring out each adjustment by throwing several furrows. Be surethat with each adjustment the plow operates Fig. 9. — A walking plow and its attachments, (o) clevis, (6) beam clevis,(c) bridle, (d) beam, (e) mold board, (/) depth wheel, (g) rolling coulter,{h) jointer, (s) standard, (f) share point, shin above, {k) landside. Study the inversion of the furrow slice and be ready to explainhow and why a plow is a good pulverizing agent. The pupils shouldhold the plow as much as possible in the various tests. If a sod plow is available, a study of this form would be of value,comparing it with the garden plow above. A comparison of a walk-ing plow with a sulky plow would also be worth while. A visit to an implement dealer for the purpose of looking overthe various makes of plows might be a profitable exercise. Themanufacturers and the dealers viewpoint is as valuable as thatof the farmer. CHAPTER VORGANIC MATTER A VERT important constituent of soil is the more or lessdecomposed organic matter that has become incorporatedwith it. Organic matter is found in larger quantit
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