21b_SoilsSpring2008 - THE SOIL IN 3-D 3 Soil texture is the...

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1/9/2008 1 Soils are our Pals Soil Genesis and Environmental Factors Geography 1000 Lecture 21b Some Soil Terms to Know Oxisols where are they located and problems with leaching.-tropics and sub-tropics Alfisols for agriculture temperate zones Ultisols : acidic with high clay % (anthropogenic soils) defined. often triopical zone soils as well. Soil Horizon levels (O (humus), A (topsoil). E (Leaching zone) B, (subsoil) C (parent material) Soil texture from %s of sand, silt, and clay The Ring of fire defined---and distribution of Andisols. What is Soil? The product which results from complex interactions between humus, the detritus food web, and inorganic mineral particles including : sand, clay, silt, and parent rock material.
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1/9/2008 2 Formation Factors Absolute and Seasonal Moisture Volumes Temperature Regimes Parent Material Detritus feeders Organic Material O HORIZON A HORIZON E HORIZON B HORIZON C HORIZON HUMUS, SURFACE LITTER TOPSOIL LEACHING ZONE SUBSOIL WEATHERED PARENT MATERIAL THE SOIL IN 3-D
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Unformatted text preview: THE SOIL IN 3-D 1/9/2008 3 Soil texture is the relative proportions of sand (.02 - 2.0 mm), silt (.002 - .02 mm) and clay (.002 mm or finer…. See Chapter 8 pp. 195-1/9/2008 4 1/9/2008 5 1/9/2008 6 1/9/2008 7 1/9/2008 8 Rice Paddy soils, ―anthropogenic‖ in origin, are created by keeping the A and E horizons submereged in water for long periods of time. This limits oxygen flow to the soils, and creates particular clay mineral concentrations within the E horizons. 1/9/2008 9 1/9/2008 10 Smectites ????? Hint--Add this one to your vocabulary on a first date. They’ll know you’re a smartie!--small nodules of fine clays characteriszed by an arrangement of molecules where plates are oriented in one direction. Smectite-type clays include: Hectorite, Montmorillonite, and Nontronite. 1/9/2008 11 1/9/2008 12 Notice the close association of the Andisols with the ―Ring of Fire‖ 1/9/2008 13 1/9/2008 14 Wow, Greg…I’ll think twice before calling someone a dirtball anymore!...
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