A farmer was advised not to use a particular type of fertilizer in his crop after harvesting a crop of peas. Give one reason for such a piece of advice. Name any two crops other than pea which would have shown the same effect.

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Solution

Nitrogen fixing symbiotic bacteria (e.g. Rhizobium) remain associated with the root nodules of pea plant. These bacteria enrich the soil with ammonia and nitrate necessary for plant growth. Hence, a farmer need not use nitrogenous fertilisers in the field after harvesting a crop of peas. Besides peas gram (chana) and green pea (moong) also show the same effect.

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