Ascent of Sap
Cohesion-Tension Theory: Ascent of Sap
3 Elements: Driving Force, Adhesion, Cohesion
Driving Force: decreasing water potential gradient from soil to air
Soil y = -0.03 MPa at saturation
Roots y = -2.5 MPa
Leaves y = -3.2 MPa
Air y = -30.0 MPa
20 oC, 80% RH
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