soils - OM affects Water retention Soil compaction Nutrient...

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Physical (Mechanical) Frost Wedging Salt Cracking Bioerosion Abrasion Thermal expansion Pressure Release Chemical Dissolution Oxidation Acid-Base Organic
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In the 1990’s several scientists (not geologists) suggested that the pattern of erosion on the base of the Sphinx required flowing water, making the Sphinx over 10,000 years old. What form of weathering, if any, could have produced this effect in a desert? A. Acid rain B. Frost wedging C. Salt cracking D. Bioerosion E. None would
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Leaching – from O and A Accumulation – B 50% of soil is air and water Organics in O are a balance between generation and decomposition Type of soil depends on Bedrock Climate – temp., rain, etc. Vegetation Time
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Unformatted text preview: OM affects Water retention Soil compaction Nutrient retention Soil Color In many South Florida soils there is very little O layer, despite the vegetation. Why? A. Little leaching B. High temperature C. Poor bedrock D. Water saturation Soil and Farming Excessive tilling and use of N fertilizers encourages soil bacteria to destroy OM Removal of plant remains reduces OM addition Leads to excessive fertilizer use and runoff water contamination A Tale of Two Soils Front yard scraped clean down to zone B in 1994. Covered with sod. Back yard undisturbed since late 1960s. Recently cleared of 2 nd growth forest (Oak, Gum, Holly, Hickory, Magnolia)....
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soils - OM affects Water retention Soil compaction Nutrient...

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