Q.76
If water is held in a soil at a suction of 1 bar, what will be the pF equivalent ?
- Schofield's pF Scale: Defined as the common logarithm of the soil moisture suction head expressed in centimeters of water column ($cm\ H_2O$):
- Calculation for 1 bar Suction:
- $1\text{ bar} = 10^5\text{ Pa} = 100\text{ kPa} \approx 1,020\text{ cm } H_2O \approx 1,000\text{ cm } H_2O$
- Reference Values: At field capacity ($0.33\text{ bar}$), $pF \approx 2.53$; at permanent wilting point ($15\text{ bars}$), $pF \approx 4.18$. (Correct answer: Option 2)
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