SoilNitrogen CycleNitrogenFertilizersBiomassSoil MicrobiologyEcosystemSoil PollutantsNitrogen FixationNitrogen CompoundsNitrogen IsotopesBlood Urea NitrogenNitrogen DioxideReactive Nitrogen SpeciesCarbonSoil Pollutants, RadioactivePlant RootsTreesNitrogen OxidesNitratesBiodegradation, EnvironmentalPII Nitrogen Regulatory ProteinsAmmoniaBacteriaRNA, Ribosomal, 16SAgriculturePhylogenyDNA, RibosomalMolecular Sequence DataQuaternary Ammonium CompoundsDNA, BacterialPoaceaeManureSequence Analysis, DNAEnvironmental MonitoringSymbiosisNitrificationBiodiversityGlutamate-Ammonia LigaseDenitrification