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If the field capacity of a soil is 35%, permanent wilting point is 15%, density of soil is 1.6 g/cm2, effective depth of root zone is 75 cm and daily consumptive use of water for given crop is 14 mm, then the watering frequency to ensure efficient irrigation to the given crop will be ____ days. [Readily available moisture is same as available moisture]
  1. 17

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Solution

The correct option is A 17
Given,
FC=35% =0.35

PWP=15% =0.15

Depth of root zone, d=75 cm

Density of soil=1.6 g/cc

Density of water=1.0 g/cc

Depth of irrigation required,
dw=γdγw×d×[FC - PWP]=1.61×75[0.350.15]

=24cm

Daily consumptive use=14 mm=1.4 cm

Frequency of irrigation=241.4=17.1417days

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