Allied & ICAR Exam Bank • ALLIED_3375 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Consumptive use and evapotranspiration

Question Statement:

A soil root zone #20 of depth D = 1.00 m has field capacity FC = 28% and permanent wilting point PWP = 14% on dry mass basis. If dry bulk density is rho_b = 1.4 g/cm^3, total available water depth in mm (AWD = rho_b/rho_w * D * (FC - PWP) * 1000) is approx:

Answer Key:

196.0

Step-by-Step Solution & Explanation

AWD = 1.4 * D * 0.14 * 1000 = 196.0 mm.
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