Biological nitrogen fixation by epiphytic microorganisms in rice fields.
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Epiphytic-microorganisms have been observed on shallow
wetland rice, deepwater rice, and on weeds growing
in rice fields. In the wetland rice field
ecosystem, microorganisms epiphytic on rice and weeds
make a limited contribution to the nitrogen input
but blue-green algae play an important role providing
an inoculum for the regeneration of the algal blooms
that are periodically affected by adverse co~ditions.
In deepwater rice, which offers a much greater biomass
for colonization, the contribution of nitrogen
by the epiphytic BGA is of agronomical significance...