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Lecture 6 Water Movement - Soil Water Movement and...

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Soil Water Movement and Retention
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Medium for plant growth Regulator of water supplies Recycler of raw materials Habitat for soil organisms Engineering medium Functions of Soil Functions of Soil
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Functions of Soil Medium for plant growth Physical Support Gas exchange Water Temperature Nutrient source
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Functions of Soil Regulator of water supplies Infiltration Run-off Storage/Movement Distribution Purification Integral to hydrologic cycle
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Water Movement
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Two Forces Responsible for Water Movement in Soils Gravity Capillarity
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Gravity Gravity
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Capillarity Spontaneous movement of water into and through pore spaces in soil without the aid of gravity.
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Adhesion and Cohesion
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Cohesion
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Adhesion and Cohesion oxygen H H S U R F A C E adhesion oxygen H H cohesion
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Adhesion and Cohesion adhesion Cohesion (H-bonding) Surface droplet
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Adhesion and Cohesion Strong adhesion Weak adhesion
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Weak Adhesion
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Adhesion to Soil Particles Strong Adhesive Forces
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Soil Pores Adhesion and Cohesion Adhesion to the tube or pore wall Cohesion between water molecules capillarity
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Capillarity Tube/Pore wall } Force down h = 0.15 r adhesion cohesion
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Capillarity h = 0.15 r h Small pores
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