註記   條目
Nitrogen -- Environmental aspects   2
Nitrogen excretion : Weihrauch, Dirk,  2017 1
Nitrogen fertilizers   2
Nitrogen fertilizers -- Environmental aspects : Hatfield, Jerry L  2008 1
Nitrogen -- Fixation   20
Nitrogen -- Fixation -- Collected works : Broughton, W. J  1981- 1
Nitrogen -- Fixation -- Congresses   2
Nitrogen-fixing microorganisms   6
Nitrogen-fixing Microorganisms -- Collected works : Broughton, W. J  1981- 1
Nitrogen-fixing plants   3
Nitrogen-fixing plants -- Congresses : Jones, D. Gareth  1983 1
Nitrogen-fixing plants -- Metabolism : Amancio, Sara  c2004 1

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