Nitrogen-fixers--Pseudomonads and other Aerobic Bacteria--from Rhodesian Soils

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Abstract
Very numerous small transparent colonies appeared on plates of N-poor agar inoculated with soils from various places in Rhodesia. Eighty-three cultures of bacteria were isolated from these colonies, all but 2 of them small Gram-negative rods. Two cultures contained Gram-positive cocci. Thirty-nine of the isolates fixed N, 10 of them fixing as much as or more than a Beijerinckia culture grown under the same conditions. The Gram-negative isolates are not all alike; their identity is uncertain, but some might be Pseudomo-nas species, some Achromobacter (or Acinetobacter), and one good fixer might be a Flavobacterium. There are also a few isolates which attack glucose fermentatively. N-fixers of these types[long dash]aerobic bacteria with very small colonies[long dash]appear to be numerous and widely distributed in Rhodesian soils.

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