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Amount of water retained at low values of matric suction is mainly affected by
EXPLANATION
Soil Water Dynamics
- Soil Water Retention Mechanics:
- At low matric suctions (high moisture content near saturation, $0$ to $0.33\text{ bar}$ / $0$ to $33\text{ kPa}$), water is held primarily in the large capillary macropores and inter-aggregate voids; therefore, water retention is dominated by soil structure (aggregate size, pore size distribution, and bulk density).
- At high matric suctions ($\gt 1\text{ bar}$ to $15\text{ bars}$), water is held as thin adsorption films on particle surfaces, governed predominantly by soil texture and specific surface area. (Correct answer: Option 2)
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