20
Residual soil water is related to
(A) Macropores
(B) Mesopores
(C) Micropores
(D) Soil aggregates
Choose the correct answer from the option given below:
EXPLANATION
Soil Solid Phase
- Residual Soil Water:
- The residual water content ($\theta_r$) is the hygroscopic water retained at extremely high matric suctions ($\gt 15\text{ bars}$ / $1.5\text{ MPa}$ to $31\text{ bars}$) where capillary flow ceases.
- This tightly bound water is held by electrostatic dipole adsorption within the micropores and interlayer surfaces of soil colloids. (Correct answer: Option 3)
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