BIOLOGICAL FIXATION OF NITROGEN
NN
N
N N
PEA
A LEGUMINOUS PLANT
ROOT NODULES
RHIZOBIUM
AZOTOBACTER
NOSTOC
ANABAENA
ALNUS
A NON LEGUMINOUS PLANT
GINKGKO
ANOTHER NON LEGUMINOUS PLANT
PSEODOMONAS
DENITRIFYING BACTERIA
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