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Question
One farmer adds nitrogen fertiliser to grow wheat. A neighbour grows beans without adding nitrogen fertiliser. Can you think of the reasons?
๐ Concept: 2.4.2 Microorganisms and Food
Show answer
Beans have Rhizobium in their roots, so they get nitrogen naturally.
Explanation
- Wheat cannot fix its own nitrogen, so the farmer adds fertiliser.
- Bean roots have nodules with Rhizobium bacteria.
- These bacteria trap nitrogen from the air for the plant.
- So the bean farmer does not need nitrogen fertiliser.
Rhizobium in bean roots fixes nitrogen, so beans need no nitrogen fertiliser.
