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RelativeResourceManager(8) - SPACE PS PS = Vp/Vt x 100 PS...

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NRES 201 Intro to Soil Science Lec. 3-4. Soil Physical Properties Ch. 4 1/10/2011 8 Bulk density is highly variable, it varies from horizon to horizon depending upon structure and texture. Reasonable ranges. Organic soils 0.1 to 0.6 g cm -3 Minerals soils 0.9 to 1.8 g cm -3 Changes in bulk density reflect changes in the pore volume of the soil. (because particle density is constant) Geometric packing, structure forming processes, and external pressure are important (compaction). BULK DENSITY (Db) RELATIONSHIP BETWEEN Db and PERCENTAGE PORE
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Unformatted text preview: SPACE (% PS) % PS = Vp/Vt x 100 % PS = (Vt - Vs)/Vt x 100 % PS = (1 - Vs/Vt) x 100 (Volumes: Vt = total soil; Vs = solids; Vp = pores) BULK DENSITY (Db) Soil Texture Bulk Density (g/cc) Coarse, Medium, and Fine Sand; Loamy Sands other than Loamy Very Fine Sand 1.80 Very Fine Sand; Loamy Very Fine Sand 1.77 Sandy Loams 1.75 Loam; Sandy Clay Loam 1.70 Clay Loam 1.65 Sandy Clay 1.60 Silt; Silt Loam 1.55 Silty Clay Loam 1.50 Silty Clay 1.45 Cla y 1.40 Bulk Densities When Roots Begin to Have Problems...
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