Second, a low level of nodulation
by stray bacteria would dilute the effect on plants of their interaction with intended bacterial isolates, and will therefore be a random factor tending to obscure differences among inoculation treatments.
In 2 years of field studies in Upper Marlboro, Maryland, we've obtained a statistically significant 25-percent increase in nodulation
and a numerical increase in seed yield on plants inoculated with the new bacterium, as compared with another strain known as USDA 110," says Kuykendall.
fixed the atmospheric nitrogen which ultimately supported in higher crop growth of soybean.
These results are in agreement with those reported by DOBEREINER (1966), which suggested that nodulation
can be used as an indicator of BNF efficiency.
2008) evaluated the nodulation
of peanut, using sandy and clay soils, both without previous cropping and observed that in clay soil plants had high number of nodules with improved strain and no effect in competition was verified between inoculant and native strains.
As suggested by Smith and Read  the Rhizobium nodulation
is greatly increased in legumes with the presence of endomycorrhizal fungi in the roots.
This finding indicates that the native bacteria were able to promote nodulation
in both soils, resulting in equal mean values for the variables mentioned above, which has also been observed in other studies (Kaneko et al.
Additional studies of the nodulation
status of legume species in Brazil.
Molecular characterization and regulation of the rhizosphere-expressed genes rhiABCR that can influence nodulation
by Rhizobium leguminosarum biovar viciae.
The genetic elements for nodulation
and autoregulation systems in Legumes may be involved in the accommodation of root associated microbes other than rhizobia (Seishi et al.
Parameters assessed included nodulation
, nodule effectiveness for BNF and dry weight, shoot dry weight (SDW), and grain yield.
Antagonistic to fungal pathogens has found to enhance nodulation
by Mesorhizobium in chickpea (24).