Which of the following would be one way a farmer could increase the amount of available nitrogen in his fields without adding a synthetic fertilizer?

A. Burn unwanted plants on the field.
B. Add nitrogen gas to the fields.
C. Flush the field with water.
D. Grow a legume crop to support the development of root nodules.



Answer :

Final answer:

Growing legume crops to support nitrogen availability without synthetic fertilizers.


Explanation:

Growing a legume crop to support the development of root nodules is a way a farmer could increase available nitrogen without synthetic fertilizer. Legumes have a symbiotic relationship with nitrogen-fixing bacteria in their root nodules, converting atmospheric nitrogen into a form usable by plants.


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