nitrogen cycle

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7 Terms

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Nitrogen fixation

The process of N2 gas being converted into biologically available (usable by plants) NH3 (ammonia) or NO3- (nitrate)

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Bacterial fixation

Certain bacteria that live in the soil, or in the symbiotic relations with the plant root nodules convert N2 or NO3-

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Synthetic fixation

Humans combust FFs to convert N2 gas into nitrate (NO3-)

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Ammonification

Soil bacteria, microbes and decomposers converting waste and dead biomass back into NH3 and returning it to the soil

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Nitrification

Conversion of NH4 into nitrite (NO2-) and then nitrate (NO3) by soil bacteria

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Denitrification

Conversion of soil (NO3) into nitrous oxide (N2O) gas which returns to the atmosphere

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Assimilation

Plants and animals taking in N in and incorporating it into their body