Nitrogen fixation by symbiotic and non-symbiotic bacteria can be a significant source of
nitrogen in cropping systems. However, contributions from non-symbiotic nitrogen fixation
(NSNF) are dependent on available carbon in the soil and environmental conditions (soil
moisture and temperature). In Australia, measurements of NSNF have been made in the
field by quantifying nitrogenase activity. These studies have included determinations of the
moisture and temperature requirements for NSNF and for crop residue decomposition that …

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