Allied & ICAR Exam Bank • ALLIED_1201 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Available Water Capacity

Question Statement:

A root zone soil has a depth of $0.8\text{ m}$, dry bulk density $\rho_b = 1.5\text{ g/cm}^3$ (density of water $\rho_w = 1.0\text{ g/cm}^3$), field capacity $FC = 28\%$, and permanent wilting point $PWP = 13\%$. The available water capacity (AWC in mm of water) in the root zone is:

Answer Key:

180

Step-by-Step Solution & Explanation

$AWC = \frac{\rho_b}{\rho_w} \times D \times (FC - PWP) = 1.5 \times 800\text{ mm} \times (0.28 - 0.13) = 1200 \times 0.15 = 180\text{ mm}$.
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