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28 Cards in this Set
- Front
- Back
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Bulk Density method for determining sandy texture
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Excavation
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Bulk Density method for determing clayey texture
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Undisturbed soil core.
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What could cause particle density size to be less than 2.65
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organic material
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What could cause soil particle density to be greater than 2.65
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heavy metals
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List the four main organic functional groups in humus that are associated with its negative charges
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OH
COOH O-OH with octogan around O NH2 |
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As water content of a soil decreases toward dry soil
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gravimetric potential decreases and matric potential increases
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As the water content of a soil increases toward saturated soil
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gravimetric potential increases and matric potential decreases
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Which soil would have the lowest thermal conductivity
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dry organic soil- 50% porosity
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Which soil would have the highest volumetric heat capacity
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Wet organic soil- 50% porosity
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Highest/Lowest cation exchange capacity
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Vermiculite/Kaolinite
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highest specific surface area
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smectite
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most isomorphous sub. in Al-octahedral sheet
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smectite
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highest shrink-sweel potential
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smectite
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fixed(non-exchangable) interlayer K
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Illite
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PH dependent charges
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Kaolinite
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lowest shrink-swell potential
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kaolinite
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12-18 A basal spacing
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Smectite
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lowest specific surface area
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Kaolinite
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has "fixed" 14 A basal spacing
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chlorite
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Water Content
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Clayey
Sandy |
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Specific Surface Area
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Clayey
Sandy |
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Total Porosity
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Clayey
Sandy |
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Plant available water content
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Silty
Sandy |
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Bulk Density
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Sandy
Clayey |
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Field Air Capacity
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Sandy
Clayey |
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Saturated Hydraulic Conductivity
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Sandy
Clayey |
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Surface Crust Formation
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Silty
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Cation Exchange Capacity
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Clayey
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