Multiple choice

The consumptive use of water for a crop during a particular stage of growth is 2.0 mm/day. The maximum depth of available water in the root zone is 60 mm. Irrigation is required when the amount of available water is 50% of the maximum available water in the root zone. Frequency of irrigation should be

  1. 10 days

  2. 15 days

  3. 20 days

  4. 25 days
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 $C_u = 2.0 mm/day \\ \text{Net available moisture level = 0.5 x 60 x = 30 mm} \\ \text{Frequency of irrigation} = \frac{30}{2} = 15 days$

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