7 - Soil Properties and Environmental Factors

7 - Soil Properties and Environmental Factors - Soil...

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Soil Properties and Environmental Factors
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Soil Pore Space Affects rate of movement of air and water through soil Determined by soil texture and aggregate size Based on particle size alone: sand>silt>clay But clay particles can form larger aggregates, so depends on aggregate size
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Pore Space Macropores = space between soil aggregates --- drainage Micropores = space within soil aggregates --- water holding
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Pore Space
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Soil Moisture, Micropores, and Water Holding Capacity Water holding capacity depends on soil type (especially amount of micropores) Sand = light Silt = medium Clay = heavy Some clays hold more water than others Organic matter has high water holding capacity
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Soil Moisture, Macropores, and Water Movement Water movement depends on size of macropores Rapid movement leaching of nutrients; drying of soil and wilting of plant Plant growth between wilting point and field capacity
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Wilting point – soil water not available to
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7 - Soil Properties and Environmental Factors - Soil...

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