Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Nitrogen fixation-en#Sense
Nitrification-fr#Sense
Fissazione dell'azoto-it#Sense
Fixation de l'azoté-fr#Sense
Stickstoffbindung-de#Sense
Fijación del nitrógeno-es#Sense