Water potential of soil quantified in term of

Options

A. Pressure
B. Volume
C. Molar concentration
D. Molal concentration

Answer

### Step-by-Step Solution:

1. **Understanding Water Potential**: Water potential is a measure of the potential energy of water in a system and is a key concept in understanding water movement in plants and soil.

2. **Quantifying Water Potential**: Water potential in soil is quantified in terms of pressure potential. Pressure potential is the physical pressure exerted by water in the soil.

3. **Role of Atmospheric Pressure**: The pressure potential is influenced by the atmospheric pressure and the amount of water present on the soil surface.

4. **Saturation Conditions**: When the soil is saturated with water, the pressure potential is considered to be positive. This indicates that there is a higher potential for water movement due to the presence of excess water.

5. **Unsaturated Conditions**: In contrast, when the soil is unsaturated, the pressure potential is typically taken as zero. This means that there is less water available for movement, and thus the potential is lower.

6. **Conclusion**: Therefore, the correct option for quantifying the water potential of soil is pressure potential, rather than concentration (molar or molal) or volume.

### Final Answer:
The water potential of soil is quantified in terms of **pressure**.

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