ENVS 2060 Lecture Notes - Lecture 13: Gravitational Potential, Water Potential, Water Content
31 Mar 2016
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Adhesion attraction to pull water up capillaries. Cohesion between the walls, keeping water where it is. Soil is held in the soil in the same way it"s held in capillaries. G = gravity r = radius of pore (cm) h = height of water column. Water potential (energy status, ability to do work) Depth equivalent the depth equivalent of water in given depth of soil. Pull of water on small pores against the pull of gravity. Osmotic potential o transfer of water from low ion concentration to concentration of salts between two membranes: need permeable membrane, lower salt on one side causes osmotic pressure to force water into the seed. Gravitational g the energy of he status of the water with respect to some reference point: set the reference point wherever, energy based on height in a gravitational ield (top of table and. Normally use soil surface or water table as reference point.
