from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The difference between the amount of nitrogen taken into the body or the soil and the amount excreted or lost.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the balance between the amount of nitrogen taken in (to the soil or the body) and the amount given off (lost or excreted)
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