How is nitrogen present in atmosphere used by plants?
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Ammonium taken in by plants is used directly in proteins. This form is not lost as easily from the soil. Organic nitrogen exists in many different forms. It is changed into ammonium, then into nitrates, by microorganisms.
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Plants get their nitrogen from the soil and not directly from the air. ... The act of breaking apart the two atoms in a nitrogen molecule is called "nitrogen fixation". Plants get the nitrogen that they need from the soil, where it has already been fixed by bacteria and archaea.
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