which gas in the air maintains the fertility of the soil?
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In the atmosphere, nitrogen exists as a gas (N2), but in the soils it exists as nitrogen oxide, NO, and nitrogen dioxide, NO2, and when used as a fertilizer, can be found in other forms, such as ammonia, NH3, which can be processed even further into a different fertilizer, ammonium nitrate, or NH4NO3.
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Answer:
...Nitrogen....
It exist as NO and NO2 in soil.
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