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The field capacity of a soil is 25%, its permanent wilting point is 15% and specific dry unit weight is 1.5 g/cc. If the depth of the root zone of a crop is 80 cm, the storage capacity of the soil is
  • a)
    8 cm
  • b)
    10 cm
  • c)
    12 cm
  • d)
    14 cm
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The field capacity of a soil is 25%, its permanent wilting point is 15...
Given:
Field capacity = 25%
Permanent wilting point = 15%
Dry unit weight = 1.5 g/cc
Root zone depth = 80 cm

To find: Storage capacity of the soil

Formula:
Water holding capacity = Field capacity - Permanent wilting point
Storage capacity = Water holding capacity * Root zone depth * Dry unit weight

Calculation:
Water holding capacity = 25% - 15%
= 10%

Storage capacity = 10% * 80 cm * 1.5 g/cc
= 12 cm

Therefore, the storage capacity of the soil is 12 cm.
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Community Answer
The field capacity of a soil is 25%, its permanent wilting point is 15...
For an irrigation land:

SC = Saturation capacity, FC = Field capacity, OMC = Optimum moisture content, PWP = Permanent welting point and UWP = Ultimate welting point
  • Equivalent depth of water held at field capacity (x) = S × d × Fc
  • Equivalent depth of water held at PWP (x’) = S × d × (PWP)
  • Available moisture/storage capacity of soil (y) = S × d × (Fc - PWP)
  • Readily available moisture content (dw) = S × d × (Fc - OMC)
Given:
Field capacity (F. C) = 25 % = 0.25
Permanent willing point (PWP) = 15 % = 0.15
Depth of the root zone (d) = 80 cm
Dry Unit weight of soil (γd) = 1.5 g/cc
Calculations:

Hence, the storage capacity of the soil is 12 cm.
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The field capacity of a soil is 25%, its permanent wilting point is 15% and specific dry unit weight is 1.5 g/cc. If the depth of the root zone of a crop is 80 cm, the storage capacity of the soil isa)8 cmb)10 cmc)12 cmd)14 cmCorrect answer is option 'C'. Can you explain this answer?
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