Soils and fertilizers . become con-stant, note time necessary to draw one hterof air through the sand. Using clay loam in place of sand, runthe experiment again, bringing the water inthe aspirating bottle up to its original markbefore starting. The time necessary to puUa liter of air through each soil serves as ameasure of the comparative rate of possibleair movement through them. Without removing the clay loam from thefunnel, add enough water to bring it tooptimum moisture condition. Repeat thetest above. Explain results. Fig. 26. — Apparatus Ti Tx mi. e i_ for studying the relative Exercise
Soils and fertilizers . become con-stant, note time necessary to draw one hterof air through the sand. Using clay loam in place of sand, runthe experiment again, bringing the water inthe aspirating bottle up to its original markbefore starting. The time necessary to puUa liter of air through each soil serves as ameasure of the comparative rate of possibleair movement through them. Without removing the clay loam from thefunnel, add enough water to bring it tooptimum moisture condition. Repeat thetest above. Explain results. Fig. 26. — Apparatus Ti Tx mi. e i_ for studying the relative Exercise II. — The presence of carbon ^^^^ „, ^j^ movement dioxide in soil air. through soils. (A) soil in Materials. — Box of rich soil in good mois- funnel, (B) cotton sup- ture condition, flask, limewater, tubes. ae^foPwater™*^ ** Procedure. — Equip a flask or bottle asshown in Fig. 27 so that air from the soil may be sucked into thelimewater. The turbidity of the limewater indicates the presenceof carbon Tube {or uAlhdraiulnq/ soil
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Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectfertilizers
