Soil fertility can be sustain by input of Organic manure composed with( cowdung/urine and rice/wheat/cake/ husk) with microbe culture for 7 days, and rotational crops traditional varieties.Biochar of forest waste,and waste of fireed crop in forest also very important in soil fertility.
This is Good for the revision of chapter-Soil in India (Geography).Thanks for providing this.
Reh karl thur chopan rukar are different name of saline/alkaline soil . Not BLACK SOIL !
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Very nice and healthy from exam point of view question.