1. The population density of nitrogen-fixing bacteria, phosphobacteria and potassium-bacteria was the greatest in rich soil, second in moderate soil, and lowest in poor soil.

2. Currie is studying whether nitrogen-fixing bacteria help break down the ants' leaf cuttings into a fungally-digestible form.

3. The effect of cellulose-decomposing fungus(CDF) mixed with associative nitrogen-fixing bacterium(ANFB) to cellulose-decomposing has been studied.

4. Like rhizobia , the nitrogen-fixing endophyte Frankia elicits the formation of specialized root nodule structures which house BNF processes.

5. In effect, free-living nitrogen-fixing organisms are in situ green manures since most N derived from BNF is released to the soil solution only after cell death.

6. Actinorhizal Plants are a kind of important natural nitrogen-fixing resources, and they have high value in reforestation as pioneer and accompanying species.

7. Researchers have focused on the variety of nitrogen-fixing organisms which convert N2 from the atmosphere into forms for plant assimilation.

8. When soil is poorly aerated(), the activity of nitrogen-fixing bacteria is slowed down. This results in reduced soil fertility.

9. Symbiotic nitrogen-fixing bacteria invade the root hairs of host plants, where they multiply and stimulate the formation of root nodules, enlargements of plant cells and bacteria in close association.

10. Coralloid roots A type of root regularly produced by cycads, which contains symbiotic nitrogen-fixing cyanobacteria in root nodules, giving the roots a knobbly coral-like appearance.

11. Regrettably, 2, 4-D killed not only dandelions but also plants that were beneficial to lawns, like nitrogen-fixing clover.

12. The results are theoretically and practically significant for the research on biological nitrogen fixation in plants of Graminae and the popularization of nitrogen-fixing bacteria.

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13. Although there is 34,500 tons of gaseous nitrogen in the air column above each acre of the earth's surface, this cannot be used by plants until it has been fixed by nitrogen-fixing bacteria and algae.

14. Fertilization obviously increased the amount of fungi and decreased the amount of actinomycetes and nitrogen-fixing bacteria in different soil layers.

15. Continuing treatments with acid, alkali and heating, a strain whose capability of nitrogen-fixing increase 458.65% comparing with the starting strain was obtained.

16. Nitrogen for plant nutrition is mainly obtained from three sources: nitrogen-fixing plant, rain water and manure.

17. Interplanting with Cassia rotundifolia Pers significantly decreased the amount of fungi and increased the amount of actinomycetes and nitrogen-fixing bacteria in different soil layers.

18. The effects of mixed cropping with maize on microstructure and nitrogen-fixing function of peanut nodule were studied in pot experiment.

19. Industries for production and distribution of legume inoculants containing the nitrogen-fixing soil bacteria rhizobia have been well established for more than 60 years.

20. Environmental factors are always one of the major reasons why the symbiotic nitrogen-fixing system of rhizobia and legumes cannot come into full play in agricultural production.