Allied & ICAR Exam Bank • ALLIED_1228 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Soil Bulk Density and Porosity

Question Statement:

An agricultural soil core has a dry bulk density $\rho_b = 1.325\text{ g/cm}^3$ and a particle density $\rho_s = 2.65\text{ g/cm}^3$. The soil porosity $n = \left(1 - \frac{\rho_b}{\rho_s}\right)$ expressed as a percentage is:

Answer Key:

50

Step-by-Step Solution & Explanation

$n = \left(1 - \frac{1.325}{2.65}\right) \times 100 = (1 - 0.50) \times 100 = 50.0\%$.
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