ANSWER:
→Nitrogen gas from the atmosphere is fixed into organic nitrogen by nitrogen-fixing bacteria. This organic nitrogen enters terrestrial food webs. It leaves the food webs as nitrogenous wastes in the soil.
A molecule of nitrogen may enter the soil system as organic-N from crop residues or other plant or microbial biomass, from animal manures or organic wastes (for example, sewage sludge or food processing residues), and through the action of leguminous plants such as alfalfa that take nitrogen from the atmosphere and ...
→There are three major ways in which this happens
1.by lightning
2.by industrial methods
3.by bacteria living in the soil. Nitrogen is taken up by roots of plants, and organisms that eat the plants are able to use the nitrogen to build amino acids and proteins.
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