Lecture 3-Soil Water Potential

Lecture 3-Soil Water Potential - Soil Water Potential Water...

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Soil Water Potential & Water Movement Factors ∙   Energy ∙   Characterization
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Total Water Potential: Type of Forces Soil water is subject to a number of force fields, which cause its potential to differ from that of pure water Adhesive forces on soil matrix [hydrogen bonding, dipole, surface tension] Coulombic forces with solutes in soil water Cohesive forces between water molecules
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Matric & Gravitational φ T = φ G + φ M + Others ...... φ T = Total water potential φ G = Gravitational potential φ M = Matric potential
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( φ G ): Is due to the Force of Gravity It depends on the location of water molecules on the surface of the earth. The water molecules are influenced by the force of attraction per unit mass towards the center of the earth (g = dyne/g or cm/sec 2 ). Gravitational potential (z): Is measured as the vertical distance from the reference level to the point of interest.
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( φ G ): is due to the Force of Gravity It is measured outside the system.
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