Irrigation water is to be provided to a crop in a field to bring the moisture content of the soil from the existing $18 \%$ to the field capacity of the soil at $28 \% .$ The effective root zone of the crop is 70 $\mathrm{~cm}$. If the densities of the soil and water are $1.3 \mathrm{~g} / \mathrm{cm}^{3}$ and $1.0 \mathrm{~g} / \mathrm{cm}^{3}$ respectively, the depth of irrigation water (in $\mathrm{mm}$ ) required for irrigating the crop is
Irrigation water is to be provided to a crop in a field to bring the moisture content of the soil from the existing $18 \%$ to the field capacity of the soil at $28 \% .$ The effective root zone of the crop is 70 $\mathrm{~cm}$. If the densities of the soil and water are $1.3 \mathrm{~g} / \mathrm{cm}^{3}$ and $1.0 \mathrm{~g} / \mathrm{cm}^{3}$ respectively, the depth of irrigation water (in $\mathrm{mm}$ ) required for irrigating the crop is
On a $4 \%$ land slope in a medium rainfall zone, the horizontal spacing of bunds in meter and the length of bunds per hectare in meter, respectively are
(A) 25 and 300
(B) 25 and 400
(C) 30 and 300
(D) 30 and 400
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