A soil has a field capacity of 23% and wilting coefficient of 11%. The dry unit weight of soil is 1.5 gm/cc. The root zone depth is 70 cm. Irrigation water is applied when moisture content falls to 15%. If the water application efficiency is 75%, the water depth required to be applied on the field is _____ (cm)
11.2

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Solution

The correct option is A 11.2
Water depth required at canal = $G \times d \times (F C - O M C)$

$= 1.5 \times 70 \times (0.23 - 0.15)$

$= 8.4 c m$

Water depth required at field,
$= \frac{8.4}{η_{a}}$

$= \frac{8.4}{0.75} = 11.2 c m$

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The correct option is A 11.2Water depth required at canal = G×d×(FC−OMC) =1.5×70×(0.23−0.15) =8.4 cm Water depth required at field, =8.4ηa =8.40.75=11.2 cm

The correct option is A 11.2
Water depth required at canal = $G \times d \times (F C - O M C)$

$= 1.5 \times 70 \times (0.23 - 0.15)$

$= 8.4 c m$

Water depth required at field,
$= \frac{8.4}{η_{a}}$

$= \frac{8.4}{0.75} = 11.2 c m$