Black soil requires least tilling because (a) it is fertile (b) it develops cracks on drying
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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(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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