Question

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

Answer 1

Reasons for the given condition:

1. Pea is a leguminous plant that has nitrogen-fixing symbiotic bacteria like Rhizobium in its root nodules.
2. These nitrogen-fixing bacteria take the atmospheric nitrogen and enrich the soil with nitrogen-containing compounds like ammonia and nitrates, which are useful for plant growth and development.
3. As a result, after harvesting a crop of peas, a farmer does not need to use nitrogenous fertilizers in the field because excess nitrogen in the soil can kill the plants.

Crops that show the same effect:

1. Soybean
2. Lupins
3. Peanut
4. Grams