Bio36_11_Soil - 1 2 3 1 4 1 2 5 6 Overview Ch. 11: Soil...

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1 Overview • Ch. 11: Soil – Soil Degradation – Soil Conservation Soil Characteristics • Soil – Supports plant growth Soil Texture • Weathering of parent material – Sand: 0.063 – 2.0 mm – Silt: 0.004 – 0.063 mm – Clay: < 0.004 mm • Proportions – Loam: 40% sand, 40% silt, 20% clay Soil Properties • Larger particles – Separated by larger spaces • Smaller particles – Higher surface area • Nutrients ions & water – Cling to particle surfaces Soil Profiles • O horizon – Humus • A horizon – Topsoil • E horizon – Zone of leaching • B horizon – Subsoil • C horizon – Weathered parent material Soil Classification • 12 soil orders • Mollisols (dark green) – Prairie soils • Oxisols (red) – Tropical forest soils • Alfisols (light green) – Temperate forest soils • Aridisols (orange) – Dryland soils Soil Fertility • Ability to support plant growth – Accessible nutrients – Accessible water – Good aeration – Near neutral pH – Low salt content • Mineral nutrients 1 2 3 1 4 1 2 5 6 7 8 1 2
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2 – E.g., NO 3 - , PO 4 3- , K + , Ca 2+ – Nutrient-holding capacity •Nutrients lost by leaching – Fertilizer •Organic fertilizer •Inorganic fertilizer
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This note was uploaded on 01/12/2012 for the course BIOLOGY 36 taught by Professor Teresafinnern during the Fall '11 term at Riverside Community College.

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Bio36_11_Soil - 1 2 3 1 4 1 2 5 6 Overview Ch. 11: Soil...

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