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N₂ → NO
Nitrogen Gas → Nitrogen Monoxide
NO₂ → HNO₃
Nitrite → Nitric Acid
Lightning and Cosmic Radiation
N₂ → NH₃
Nitrogen Gas → Ammonia
Soil Micro-organisms- Rhizobium bacteria and Legumes
NH₃ → NO₂⁻ → NO₃⁻
Ammonia → Nitrite → Nitrate
Micro-organisms- Nitrosomas (NO₂⁻) and Nitrobacter (NO₃⁻)
Nitrogenous waste and organic matter into inorganic ammonia
Decomposing micro-organisms like bacteria and fungi
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