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The available moisture holding capacity of soil is 15cm per meter depth of soil. If a crop with a root zone of 0.8m and consumptive use of 6 mm/day is to be grown, the frequency of irrigation for restricting the moisture depletion to 60% of available moisture is?
  • a)
    12.5 days
  • b)
    12 days
  • c)
    10 days
  • d)
    8 days
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The available moisture holding capacity of soil is 15cm per meter dept...
Available moisture holding capacity = 15×0.8 = 12cm
Readily available moisture content = 0.4×12 = 4.8cm
Frequency of irrigation = 48/6 = 8 days
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Most Upvoted Answer
The available moisture holding capacity of soil is 15cm per meter dept...
Given:
Available moisture holding capacity of soil = 15 cm/m
Root zone depth = 0.8 m
Consumptive use = 6 mm/day
Moisture depletion to be restricted to 60% of available moisture

To find:
Frequency of irrigation

Solution:
Total available moisture in the root zone = Available moisture holding capacity of soil x Root zone depth
= 15 cm/m x 0.8 m
= 12 cm

Maximum allowable depletion of moisture = 60% of available moisture
= 0.6 x 12 cm
= 7.2 cm

Amount of water consumed by the crop per day = Consumptive use
= 6 mm/day

Amount of water consumed by the crop in the root zone = Consumptive use x Root zone depth
= 6 mm/day x 0.8 m
= 4.8 cm

Frequency of irrigation = Maximum allowable depletion of moisture / Amount of water consumed by the crop in the root zone
= 7.2 cm / 4.8 cm
= 1.5 days

Therefore, the frequency of irrigation required to restrict the moisture depletion to 60% of available moisture is 8 days (approx).

Answer: Option (d) 8 days.
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The available moisture holding capacity of soil is 15cm per meter depth of soil. If a crop with a root zone of 0.8m and consumptive use of 6 mm/day is to be grown, the frequency of irrigation for restricting the moisture depletion to 60% of available moisture is?a)12.5 daysb)12 daysc)10 daysd)8 daysCorrect answer is option 'D'. Can you explain this answer?
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