SoilNitrogen CycleNitrogenFertilizersBiomassSoil MicrobiologyEcosystemSoil PollutantsNitrogen FixationNitrogen CompoundsNitrogen IsotopesBlood Urea NitrogenNitrogen DioxideReactive Nitrogen SpeciesCarbonSoil Pollutants, RadioactiveNitrogen OxidesPlant RootsTreesBiodegradation, EnvironmentalNitratesPII Nitrogen Regulatory ProteinsAmmoniaRNA, Ribosomal, 16SBacteriaAgriculturePhylogenyDNA, RibosomalQuaternary Ammonium CompoundsMolecular Sequence DataDNA, BacterialPoaceaeManureSequence Analysis, DNASymbiosisNitrificationDenitrificationGlutamate-Ammonia Ligase