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THE NITROGEN CYCLE.
· N. is essential to all living things.
· Its found in proteins and Nucleic Acids.
· Atmospheric N is very unreactive,
· NN it has a triple bond.
· N2 passes in and out of the plant; unused.
· To be of use it must be converted to either
NH3(ammonia) or NO3(nitrate).…read more

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N. FIXATATION BY LIVING
THINGS.
· Mainly done by RHIZOBIUM bacteria.
· Which lives freely in the soil or .....
· On the roots of many plants,
specially...
· LEGUMINOUS plants such as peas,
beans and clover.
· Most N fixing occurs when Rhizobium
is living on plant roots.…read more

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ROOT NODDULES…read more

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RHIZOBIUM.
· Rhizobium uses an enzyme called
NITROGENASE.
· To convert N2 to NH4+.
· To do this it needs:
· HYDROGEN (from N.A.D.P.)
· A.T.P.(from respiration)
· ANAEROBIC CONDITIONS.…read more

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