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16 Cards in this Set
- Front
- Back
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Soil Texture |
The relative proportions of sand, silt, and clay mineral particles in a given soil. |
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Soil Structure |
The degree that soil particles naturally arrange into aggregates that vary in form of size, such as a granular, platy, massive, and single grained. |
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Bulk density |
The weight per unit volume of non-disturbed soil that has been completely dried, commonly expressed as g/cc. |
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Total porosity |
Sum of macro and micro pores in a given volume of soil. |
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Saturation |
When all of the pores are filled with water; and the soil moisture tension is at 0 bars. |
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Field capacity |
The maximum amount of water a soil can hold against the downward force of gravity when excess water has been applied to soil; and hold water at a tension of 1/3 bar. |
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Permanent wilting point |
The percentage of water in the soil when plants wilt permanent and the soil cannot supply water at a rate suffient to maintain bars; and the soil moisture tension is held at 15 bars. |
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Infiltration |
Water moving into soil. |
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Percolation |
Water movement through soil. |
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Adhesion |
The forces of attraction between soil particles and water particles. |
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Cohesion |
The forces of attraction between water molecules. |
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Cation Exchange Capacity (CEC) |
Measure of how many cations a soil can hold. |
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Saline soil |
Any ion in surplus to many soluble salts. |
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Sodic soil |
Ions in surplus of sodium. |
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Soil pH |
A notation to express the alkalinity or acidity of a solution. |
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Base cation saturation ratio |
pH between 6.2-7.3 |
