Nitrogen-fixing Rhizobium bacteria are located within specially formed cells of legumes such as pea and soybean.
The nitrogen-fixing nodule bacteria can be cultivated on artificial media, and many attempts have been made to utilize them for practical purposes.
The nitrifying, nitrogen-fixing, sulphurand iron-bacteria he regards as monotrophic, i.e.
The researches of later years have demonstrated that a still more inexhaustible supply of nitrogen is made available by the nitrogen-fixing bacteria of the soil.
Hippocrepis comosa is a nitrogen-fixing legume and prefers soils that are deficient in nitrogen.
