Nitrogen cycle: out of reach.
Seitzinger
Sybil
S
D001419:Bacteria / Q000378:metabolism; D017753:Ecosystem; D006802:Human Activities; D009566:Nitrates / Q000032:analysis / Q000378:metabolism*; D009573:Nitrites / Q000032:analysis / Q000378:metabolism*; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism; D010944:Plants / Q000378:metabolism; D045483:Rivers / Q000737:chemistry*
D009566:Nitrates; D009573:Nitrites; D009584:Nitrogen