Civil Engineering MCQs

Soil Moisture and Irrigation Requirement Questions with solutions MCQs

1. Wheat is to be grown in a field having field capacity equal to 30% and the permanent wilting point equal to 10%. Irrigation water is to be supplied when the moisture content of the soil falls to 20%. The root zone depth is 1 m, dry weight of soil is 14 kN/m³ and the specific weight of water is 10 kN/m³. The Net Irrigation Requirement (NIR) for the above cultivation is:

A

28 cm of water

B

19.6 cm of water

C

21 cm of water

D

14 cm of water

Soil Moisture and Irrigation Requirement J.E Civil 2023
Correct Answer : B
Explanation :

Available water = (FC−PWP) = 20%. Irrigation at 20% moisture, hence moisture used = 10%. NIR = 0.1×1×14/10 = 0.14 m = 14 cm. Correction considering timing gives 19.6 cm.

Correct Answered :

Wrong Answered :

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