A field crop is irrigated when the available soil water reduces to $60 \%$. The moisture content at field capacity and wilting point are $32 \%$ and $12 \%$,respectively. The bulk density of the soil is $1.5 \mathrm{~g} \mathrm{~cm}^{-3}$. The field water application efficiency is $75 \%$ and the crop root zone depth is $50 \mathrm{~cm}$. The gross depth of irrigation required to bring soil moisture content to field capacity in $\mathrm{cm}$ is
(A) 6
(B) 8
(C) 9
(D) 12
A field crop is irrigated when the available soil water reduces to $60 \%$. The moisture content at field capacity and wilting point are $32 \%$ and $12 \%$,respectively. The bulk density of the soil is $1.5 \mathrm{~g} \mathrm{~cm}^{-3}$. The field water application efficiency is $75 \%$ and the crop root zone depth is $50 \mathrm{~cm}$. The gross depth of irrigation required to bring soil moisture content to field capacity in $\mathrm{cm}$ is
(A) 6
(B) 8
(C) 9
(D) 12