sw24 - Exam III is Wednesday March 31st Updated study guide...

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Exam III is Wednesday, March 31 st Updated study guide will be posted Friday Review session will be held on March 29 th in class
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Soil Morphology and Taxonomy
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Subordinate Distinctions g – gleying h – illuvial organic matter p – plowing/disturbance t – clay accumulation w – non illivial development of color/structure o – oxic g, h, p, t, w, o
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Subordinate Distinctions and Organic Matter
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a, e, i Denotes the degree of organic matter decomposition in the O horizon . Oa – highly decomposed (sapric) Oe – moderately decomposed (hemic) Oi – slightly decomposed (fibric) Sapric –most decomposed, low plant fiber, low water content Hemic – intermediate decompostion Fibric – least decomposed, recognizable fibers Subordinate Distinction
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Summary Master: O, A, E, B, C, R Subordinate symbols: g, h, p, t, w and a,e,i Examples: Oa, Oe, Oi Bt Bg Btg Bw Ap
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Other Designations
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Vertical Subdivisions Characterized by similar master and/or subordinate properties separated by “degree”. Bt1 Bt2 Bt3 Bt horizons
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Transitional Horizons Transitional layers between master horizons. A E E B B E Dominant character Subordinate Character
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Synthesis Ap AE E Bh Bt Btg1 Btg2 *
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Extra Credit: 1. The subordinate distinction, h, refers to accumulation of ______________ 2. The Subordinated distinction g refers to ____ 3. The dominant character of an AB transitional horizon is the ____________ horizon. 4. The “p” subordinate distinction applies to the ______ master horizon 5. Identify one way that a Bt1 might differ from a Bt2 horizon.
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Soil Taxonomy
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Soil Classification/Taxonomy
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