A crop has effective root zone depth of $1200 \mathrm{~mm}$ and monthly ( 30 days) crop evapotranspiration of $260 \mathrm{~mm}$. The effective rainfall during 30 days period is $20 \mathrm{~mm}$. The field capacity and permissible soil moisture depletion (volume basis) are $16 \%$ and $8 \%,$ respectively. The irrigation interval in days for the crop will be

(A) 30

(B) 18

(C) 12

(D) 8

A crop has effective root zone depth of $1200 \mathrm{~mm}$ and monthly ( 30 days) crop evapotranspiration of $260 \mathrm{~mm}$. The effective rainfall during 30 days period is $20 \mathrm{~mm}$. The field capacity and permissible soil moisture depletion (volume basis) are $16 \%$ and $8 \%,$ respectively. The irrigation interval in days for the crop will be

(A) 30

(B) 18

(C) 12

(D) 8

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