Which one of the following is <strong>NOT</strong> a nitrogen fertilizer?
- A. (NH_4)_2SO_4
- B. NH_4NO_3
- C. N_2 ✓
- D. (NH_2)_2CO
Correct Answer: C. N_2
Explanation
While nitrogen gas (N_2) makes up 78% of the atmosphere, it is inert and cannot be absorbed directly by most plants, so it is not used directly as a fertilizer.
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