Lecture 7 - 03:27 Soil: Whats in the soil Organic matter:...

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Unformatted text preview: 03:27 Soil: Whats in the soil Organic matter: Minerals Nitrogen Water Broken down rock (bedrock) More than 20,000 identified types of soil in the US Soil Weathered rock formed from physical, chemical, and biological factors Water and wind breaks down rock Factors influencing formation: Parent rock material Climate Extremes Organic material Topography Hill wont have water building up but will have erosion Valley water will sit at times Times Tillage/compaction from traffic What do we do as humans to the soil Soils come from rocks Igneous rocks Granite Sedimentary rocks Sandstone, limestone Metamorphic rocks Marble, gneiss, slate Madison has lots of calcium deposits sandstone, limestone Soils are modified by climate and environment Freeze and thaw Water Wind Glaciation Cooling and heating Acid formation From air impurities Roots Other changes - Physical: Breaking and grinding of rocks Chemical: Hydration, oxidation, hydrolysis Biological: Organic materials as part of our soils Bacteria Fungi Algae Lichens Bryophytes Early land plants Small vascular plants More you garden, the better your soil becomes because you add more organic material every time Topography and effects on soil Slopes are more vulnerable to erosion Lowlands are more vulnerable to flooding Role of soil for the plant Physical support anchorage Nutrients Moisture Buffering Temperature, pH, moisture changes will happen more slowly Soil profile Topsoil A horizon Subsoil B/C horizon Parent material Ex: low organic soils of Mali Redder soil...
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This note was uploaded on 02/17/2012 for the course HORTI 120 taught by Professor Paterson during the Fall '11 term at Wisconsin.

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Lecture 7 - 03:27 Soil: Whats in the soil Organic matter:...

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