Date post: | 15-Jul-2015 |
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Science |
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Group C4
Due to gravitational forces
According to concentration gradient
Water moves from high water potential to low water potential
Wet soil to dry soil
Wet soil
◦ High amount of pore space
◦ High water potential
Dry soil
◦ Low amount of pore space
◦ Low water potential
Gravimetric potential◦ Helps water to move by gravity
Pressure potential◦ Submerged potential
◦ Matrix potential
Osmotic potential◦ Moves water according to the dissolving of particles
Capillary force◦ Adhesion and cohesion
Adsorptive forces
Osmotic forces
Capillary force
◦Due to adhesive and cohesive powers
Adhesion
Tendency of dissimilar particles or surfaces to cling to one another
Cohesion
Tendency of similar or identical particles to cling to one another
◦Due to properties of water, it moves through the soil
◦ Small pores in the soil can be assumed as capillary tubes
◦ r α 1/h
◦ Large pore space – low water movement
◦ Small pore space – high water movement
Water binds strongly to mineral surfaces due to polarity in molecules
This results in forming a thin water film
Water moving between roots and soil
Through the cell membranes of root hairs, which are semi permiable
According to a water potential gradient
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