Question

The following data pertains to healthy growth of a Crop: 1. Field capacity of soil = 32% 2. Permanent wilting point = 11% 3. Density of soil = 1500kg/m3 4. Effective depth of root zone = 75 cm 5. Daily consumptive use of water for the given crop = 12 mm For healthy crop growth, moisture content must not fall down to 20% of the water holding capacity between the field capacity and the permanent wilting point, then the watering interval (in days) is

A
12
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B
17
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C
15
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D
16
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Solution

The correct option is C 15Since, for healthy crop growth, moisture content should not fall below 20% of the water holding capacity between the FC and PWP. Therefore, readily available moisture = 80% of (FC- PWP) =80100(0.32−0.11)=0.168or 16.8% So, if the readily available moisture is lost completely then we have to irrigate the crop. Depth of water lost =γγw×d× (Readily available moisture) =15001000×0.75×0.168 (γw=1000kg/m3) =0.189m=189mm Daily consumptive use = 12 mm ∴Watering interval=18912=15.75days So, water should be applied after every 15 days because irrigation should be done before wilting commences.

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