SCSC 301 EXAM 2 QUESTIONS WITH CORRECT ANSWERS

ease with which gases, liquids or plant roots penetrate or pass through a bulk mass of
soil or a layer of soil


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Permeability




highly decomposed OM; 'sapric'- highly decomposed

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Oa




and; parent material is volcanic ash/cinders; any epipedon; subsoils generally
amorphous materials, P fixing ability; near volcanic areas only; upper Northwest,
Alaska & HI


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Andisols




cover crops, conservation tillage, furrow dikes, contour rows, terraces, strip cropping,
adding organic matter to encourage structure


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Ways to increase infiltration




oxides of iron and aluminum, often present in mature soils and emit reds/yellows in
color


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Sesquioxides

, Bhs horizon, zone of illuvial humus with Fe and Al oxides


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Spodic




vaporization of soil water


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Evaporation




mineralology, texture, pH and stratification


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Inherited Soil Characteristics




two soils intricately mixed on landscape with little ability to predict which may be at a
specific point; at least 75% of map unit is named soils


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Complexes