A farmer did not use nitrogenous fertilizer before growing cereal crop as the soil enriched with this nutrient by the crop which the farmer might have grown earlier:

Wheat

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Gram

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Bajra

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Cotton

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Solution

The correct option is B
Gram

The correct option is B.
Explanation of the correct option:
Rhizobium is a nitrogen-fixing bacteria that live in the root nodules of leguminous plants such as gram, pea etc.
Rhizobium and leguminous plants live in symbiotic associations with each other.
Leguminous plants cannot use atmospheric nitrogen, so they form a symbiotic association with nitrogen-fixing bacteria such as Rhizobium.
These bacteria provide ammonia and nitrate to the soil, which is essential for plant growth. As a result, after harvesting a gram crop, a farmer does not need to apply nitrogenous fertilisers to the land.

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