conversion of N2 gas into usable NH4 (clouds->ground)
conversion of NH4 to NO3, first going through NO2 (all in ground)
uptake of usable nitrogen (NH4) by plants (ground->trees/plants)
organic nitrogen wastes convert/break down back to usable nitrogen forms (ground)
converting usable NH4 or NO3 into gas forms, N2 or N2O (ground -> air)
N2, non usable
NO2 -, non usable
Artificial process that take N2 and converts into chemical synthetic fertilizer, requires energy from fossil fuels
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