Soils and fertilizers . as prac-ticable. Tabulate data and draw curves. Explain the practicalimportance of the results obtained. Exercise III. — Rate of percolation of water through soils. Materials. — Dry, well-pulverized sand and clay loam, two lampchimneys, cheesecloth, torsion balance. See Exercise V, Chapter V. Procedure. — Prepare two lamp chimneys by neatly tying twothicknesses of cheesecloth over their bottoms. Place in one adefinite and known amount of sand. In the other place the sameweight of clay loam. Give each a uniform compaction. Now weigheach chimney with its content of soil.
Soils and fertilizers . as prac-ticable. Tabulate data and draw curves. Explain the practicalimportance of the results obtained. Exercise III. — Rate of percolation of water through soils. Materials. — Dry, well-pulverized sand and clay loam, two lampchimneys, cheesecloth, torsion balance. See Exercise V, Chapter V. Procedure. — Prepare two lamp chimneys by neatly tying twothicknesses of cheesecloth over their bottoms. Place in one adefinite and known amount of sand. In the other place the sameweight of clay loam. Give each a uniform compaction. Now weigheach chimney with its content of soil. Place the chimneys in such a position as to allow free drainageand add the same amount of water to each, keeping the head of waterconstant in each chimney. Observe the rate of the downwardmovement of water through the two soils. When percolation hasbegun, measure percolate for 15 minutes and express rate in cubiccentimeters per hour. Explain the reasons for the results obtained and the practicalimportance SOIL WATER 87 Exercise IV. — Water-holding capacity of soils. Materials. — Same as in Exercise III. Procedure. — When Exercise III is complete, cover chimneys andallow aU the free water to drain away. Then weigh the chimneysand wet soil. The increased weight is water retained. Calculatethe percentage of water retained by each soil based on the weightof the original sample. Write out a fuU description of the experiment and the pointsof importance that it shows. Exercise V. — Moisture conservation by means of a soil mulch. Materials. — Three tumblers, one of which should be one inchshorter than the other two, moist soil, dry clay loam and dry sand,torsion balance. Procedure. — FiU the short tumbler level full with a weU-mixedmoist soil. This is to serve as the unmulched treatment. Place CL/>rU)Af1 MULCH SflMDY LOAM MULCH MULCHI
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