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

Thank you!