sw9 - Exam I February 3rd in class(bring a pencil Study...

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Exam I February 3 rd in class (bring a pencil) Study Guide provided on Friday, Jan. 29 th Review Session on Monday February 1 st
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Soil Density and Porosity
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Soil Structure Arrangement or grouping of individual soil particles into secondary units.
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Soil Structure Peds Aggregates Units of soil Structure
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Soil Structural Types Granular, Platy, Blocky, Prismatic, Columnar
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Importance Effects on porosity, water retention, movement, roots Small pores Large pores Intra-aggregate pores Inter-aggregate pores (within) (between)
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Soil Density
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Density = Mass Volume g cm 3 ( ) 2.65 g/cm 3
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Soil Bulk Density Density of soil including the particles and the pore spaces x y z Volume = xyz B.D. ranges between 1.1 and 1.6 g/cm 3 (for mineral soil with 1 – 5% organic matter) BD = mass OD soil volume solids + pores
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Bulk vs. Particle Density Bulk density measures the mass of the soil solids in relation to the volume of the soil solids and the soil pores. x y z Particle density = Mass of particle Volume of particle No pores Bulk density = mass solids volume xyz BD = 1.6 g/cm3 PD = 2.65 g/cm 3
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Sampling for Density Known Volume
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Known Volume Dry and Weigh: mass/volume = Bulk Density
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Factors Affecting Bulk Density Texture organic matter aggregation arrangement of particles compaction depth in profile Porosity (pores are weightless)
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Sand Silt Clay Electron Micrograph Soil Texture Greater Total Porosity
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