Nitrogen research shows how some plants invade, take over others

Biologists know that when plants battle for space, often the actual battle is for getting the nitrogen.

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<p><a href="http://www.physorg.com/news166120181.html">Nitrogen research shows how some plants invade, take over others</a></p> <p>Biologists know that when plants battle for space, often the actual battle is for getting the nitrogen.</p>