1) Lightning
2) Biological
3) Bacteria
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Nitrogen can be fixed through biological nitrogen fixation by nitrogen-fixing bacteria, through industrial processes like the Haber-Bosch process, and through lightning in the atmosphere which converts nitrogen gas into nitrogen compounds that can be used by plants.
Nitrogen can be fixed by lightning during thunderstorms, by industrial processes like the Haber-Bosch method, and through biological processes carried out by nitrogen-fixing bacteria in the soil.
Nitrogen fixation in nature occurs through biological processes by symbiotic bacteria in plant roots, free-living soil bacteria, and certain types of blue-green algae in water bodies. Additionally, nitrogen can also be fixed through non-biological processes like lightning and industrial processes.
Nitrogen fixation is the process by which nitrogen gas in the atmosphere is converted into nitrogen compounds that plants can use. This can occur through biological nitrogen fixation, where certain bacteria convert nitrogen gas into ammonia, and through abiotic processes like lightning strikes, which convert nitrogen gas into nitrogen oxides that can be absorbed by rain and deposited in the soil.
Nitrogen is made available to plants through nitrogen fixation by certain bacteria that convert atmospheric nitrogen into a usable form, through decomposition of organic matter releasing nitrogen compounds, and through industrial fertilizer application.