- nitrogen fixation by lightening: lighting helps to combine nitrogen with oxygen to form nitric oxide. Further reaction’s occur to form nitrates
- Fixation by nitrogen fixing bacteria. Involves symbiotic and non-symbiotic fixation where bacteria convert free nitrogen into nitrates.
- Nitrification: involves conversion of ammonium compounds are converted into nitrites and nitrates
marto answered the question on September 30, 2019 at 06:04
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