Which of these elements help to increase the soil fertility?

Hydrogen

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Nitrogen

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Carbon

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Oxygen

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Solution

The correct option is B
Nitrogen

The correct option is (B):
Explanation for the correct option:
Nitrogen is an essential element which is necessary for the plant growth.
Availability of nitrogen increases the soil fertility.
Bacteria Rhizobium converts the available atmospheric nitrogen into usable forms like ammonia, nitrates etc.
These compounds are later taken up by the plants.
Final answer: Nitrogen help to increase the soil fertility.

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