Abstract
Aerobic nitrogen-fixing bacteria were readily isolated from Eastern Canadian soils. The majority (89%) of these soils were found to contain Azotobacter chroococcum and other members of this family. These bacteria ranged from 1 × 102 to 2.5 × 104 bacteria per gram soil. The soil type had relatively little effect on the population of these bacteria provided a soil moisture content of 10 to 18% and a soil pH of 6.5 to 8.0 was maintained. The presence of wheat or common lawn grasses did not promote better establishment of Azotobacteraceae. However, slightly larger populations of these bacteria were associated with corn, oat, and soybean rhizospheres.
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