Allied & ICAR Exam Bank • ALLIED_0482 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Soil-Water-Plant Relationship

Question Statement:

A soil has Field Capacity $FC = 28\%$, Permanent Wilting Point $PWP = 14\%$, dry bulk density $\rho_b = 1.5\text{ g/cm}^3$, and water density $\rho_w = 1.0\text{ g/cm}^3$. The root zone depth is $D = 80\text{ cm}$. The total available water holding capacity in cm is (rounded off to one decimal place):

Answer Key:

16.8

Step-by-Step Solution & Explanation

$d = 1.5 \times 80 \times (0.28 - 0.14) = 120 \times 0.14 = 16.8\text{ cm}$.
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