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27 Cards in this Set
- Front
- Back
soil texture is determined by the relative amounts of 3 groups of soil particles
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sand,silt,clay
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soil gives plants the following which are essentioal to sustain plant life
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support nutrients and water(snw)
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water is retained in or moves through the pore spaces as a result of
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the size, number and continuity of the pores, textural, structural, and organic matter
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organic
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living or once was living
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a given volume of soil contains 4 parts
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organic matter
living matter water air |
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Physically describes soil by the feel
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texture
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course soil
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larger amount of sand
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texture of flour
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silt
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loam
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mearly equal amounts of sand, silt, and clay
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microscope must be used to see
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silt
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electron microscope must be used to see
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clay particles
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a lab procedure used to find proportions of soil seperates in a soil is called
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mechanical analysis
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textural triangle used to
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determine soil texture after mechanical analysis
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3 sides of the triangle represent the
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% of sand, silt, and clay
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intersection on triangle points to of the 3 lines from each side of the triangle determine how
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the soi texture will be classified
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the arrangement of soil seperates or individual soil particles in units
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soil structure
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(individual soil particles)into units
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soil aggregates
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process that causes aggregates
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welting, drying periods, freezing/thawing, decaying, organic matter, activity of roots and small animals, absorbed nurtients, soil tillage(wdpftdoma(of)r(and)saanst)
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bulk density
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how soil retains water, the weight per unit volume of soil
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the volume includes both
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solids and pore space
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bulk density used in determing
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soil porosity
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lose porous soils have
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lower bulk density than tight compacted soil.
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tight compacted soil has
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bulk density that increase with compaction
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bulk density indicates(4)
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how easy soil will till, how easily water will infilarate, how it will hold water, and its suitability for growing plants
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space between soil particle is_________and consists of__________
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1) the pore space
2)consists of varying amounts of water and air |
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soil poristy depends on
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soil texture and structure
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the characteristics causes
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bulk density to be lighter for sands
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