Black soil requires least tilling because 

(a) it is fertile 

(b) it develops cracks on drying 

(c) it is a lava origin 

(d) it has plenty of iron and aluminium compounds

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2 Answers

(b) When it rains, the water carries the soil into cracks and thus to the lower layers; it has the same effect as tilling.

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(B) DEVELOP CRACKS ON DRYING

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