If ΨP = 03 MPa and ΨS = -0

Question

If ΨP = 0.3 MPa and ΨS = -0.45 MPa,the resulting Ψ is
A)+0.75 MPa.
B)-0.75 MPa.
C)-0.15 MPa.
D)+0.15 MPa.
E)-0.42 MPa.

Accepted Answer

Ψ is the soil water potential, which is added when water potential is positive and subtracted when negative.

Given, ΨP = 0.3 MPa (positive) and ΨS = -0.45 MPa (negative)

To find the resulting Ψ, we need to add these two potentials, i.e.,

Ψ = ΨP + ΨS

Ψ = 0.3 MPa - 0.45 MPa

Ψ = -0.15 MPa

Therefore, the resulting Ψ is negative, i.e., -0.15 MPa. Hence, the correct answer is C) -0.15 MPa.