Crossword puzzle clue "nitrogen source for plants"

Here are the possible solutions for nitrogen source for plants clue

Answer
Clue
Relevancy
soil
Clue
Nitrogen source for plants
air
Clue
It's mostly nitrogen
It's mainly nitrogen
It's about 78% nitrogen
Mixture that is mostly nitrogen
It's roughly 78% nitrogen
It's primarily nitrogen
It's mostly nitrogen and oxygen
Definition
the mixture of gases breathed by people and animals, also AYRE

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