Question

Why can’t plants use nitrogen gas directly

Answer 1

But plants do not use nitrogen directlyfrom the air. This is because nitrogenitself is unreactive, and cannot be usedby green plants to make protein.Nitrogen gas therefore, needs to be converted into nitrate compound in the soil by nitrogen-fixing bacteria in soil, root nodules or lightning.

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Answer 2

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But plants do not use nitrogen directly from the air. This is because nitrogen itself is unreactive, and cannot be used by green plants to make protein. Nitrogen gas therefore, needs to be converted into nitrate compound in the soil by nitrogen-fixing bacteria in soil, root nodules or lightning.