A soil 0.8 m deep has volumetric water content of 0.12. The quantity of water needed to bring the volumetric water content to 0.30 is
Options:
(A) 0.144 m of water
(B) 0.180 m of water
(C) 0.336 m of water
(D) 0.420 m of water
Official Answer Key:
A
Step-by-Step Solution & Explanation
Depth of water required, d = D(θ_final − θ_initial), where D is root/soil depth. d = 0.8 × (0.30 − 0.12) = 0.8 × 0.18 = 0.144 m of water. (D) mistakenly uses 0.30 alone × depth; (C) uses (0.30+0.12) instead of the difference.
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