Question

Earlier Farmers in northem india use to grow legumes as fodder in one season and wheat in the next which help in replenishment

Answer 1

the practice of having different crops in different season is called crop rotation
the rhizobium bacteria present in the root nodules of legumes fix the nitrogen i.e. they convert moreover gas in the atmosphere into ammonia, which is absorbed by the plant to convert into nitrogen. nitrogen is an essential nutrient for plant growth, development and reproduction. it helps replenish the soil with
the lost nutrient like nitrogen
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