Isolation and evaluation of inoculation effect of Azospirillum sp. on growth, colonization and nutrient uptake of crops under green house condition.

Nitrogen%fixing bacteria were isolated from the rhi zosphere of different crops in Korea and were tested for their acetylene reduction activity (ARA). A total of 13 isolates were screened and were identified to belong to the reference strains of Azospirillum. The isolates were categorized into 2 groups% A. brasilense and A. lipoferum based on their sugar and biotin requirement. Among them A. brasilense was dominant and A. brasilense strains CW301 and CW903 showed the highest ARA. β% galactosidase activity verified through