102Chapter10 - Chapter 10: Farming: Conventional and...

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Chapter 10: Farming: Conventional and Sustainable Practices
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10.1 Resources For Agriculture Soils are complex ecosystems Healthy soil fauna can determine soil fertility Your food comes mostly from the A horizon
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Soil Formation Young Soils Strongest Influence Is Parent Material Mature Soils Strongest Influences: Climate, Vegetation, Drainage
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Never Safe From Weathering
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Soil Formation Processes Leaching from Surface K, Mg, Na Ca Si Al, Fe Accumulation beneath Surface Al, Fe in Humid Climates Ca in Arid Climates Clay (Mechanical Movement)
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Soil Horizons and Profiles Soil Horizons Layers in Soil Not Deposited, but Zones of Chemical Action Soil Profile Suite of Layers at a Given Locality Some CSI myths You can’t generally identify a soil from surface material You can’t generally pinpoint a location from a
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Principal Soil Horizons O : Organic (Humus) Often Absent A: Leaching K, Mg, Na, Clay Removed B: Accumulation Absent in Young Soils Distinct in Old Soils
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Limits of Soil Formation Balance Between: Downward Lowering of Surface Downward Migration of Horizons If erosion rapid or soil evolution slow,
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102Chapter10 - Chapter 10: Farming: Conventional and...

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