Deep black soils are considered highly productive because of their high proportion of
A
Clay and Humus
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B
Sand and Zinc
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C
Gravel and Calcium
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D
Silt and Earthworm
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Solution
The correct option is B Clay and Humus Deep black soil has a high proportion of clay and humus and high retentivity of moisture and thus are very productive for cultivation of important crops like cotton, wheat, jowar, linseed, castor, sunflower, millets, rice and sugarcane.