A clayey soil has a field capacity of 0.38 m³ m⁻³ and wilting point of 0.24 m³ m⁻³. If the specific weight of the soil is 12.75 kN m⁻³ and the effective root-zone depth is 0.8 m, the available moisture holding capacity is
Options:
(A) 15.6 cm
(B) 11.2 cm
(C) 1.12 cm
(D) 20.8 cm
Official Answer Key:
B
Step-by-Step Solution & Explanation
Available moisture (volumetric basis) = (FC−WP) × root depth = (0.38−0.24) × 0.8 m = 0.14 × 0.8 = 0.112 m = 11.2 cm. (The specific weight value is extraneous when FC/WP are already given on a volumetric, i.e. m³/m³, basis.)
Practice This in Real CBT Exam Interface
Test yourself with the official TCS-iON palette, virtual calculator, and immediate performance analytics.