How long time nitrogen activity present in soil ?

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Yang Wanqin

the duration of nitrogen activity in soils depend on various biotic and abiotic factors such as soil types, climate, tillage measure, topography and others

Paul Milham

The urea may convert to nitrate within 3 days but that does not mean the N is lost. Yang stated what controls the mineralisation rate of organic N sources. Yes. Some bacteria do fix N and contribute to the terrestrial N cycle.

Rabiul Islam

Thanks Mr. Yang Wanqin & Mr. Paul Milham.