Nitrogen CycleSoilNitrogenFertilizersBiomassSoil MicrobiologyEcosystemNitrogen CompoundsNitrogen FixationNitrificationDenitrificationSoil PollutantsCell CyclePlanctomycetalesQuaternary Ammonium CompoundsNitrogen IsotopesCrenarchaeotaArchaeaAmmoniaNitrite ReductasesBacteriaNitratesNitritesAgriculturePhylogenySeawaterGenes, ArchaealTreesDNA, ArchaealNitrous OxideGeologic SedimentsOceans and SeasOxidation-ReductionClimate ChangeBiodiversityRNA, Ribosomal, 16SBlood Urea NitrogenNitrogen DioxideMolecular Sequence DataMenstrual CycleOxidoreductasesSequence Analysis, DNAReactive Nitrogen SpeciesCarbonSoil Pollutants, RadioactiveCell Cycle ProteinsGenome, BacterialPlant RootsNitrogen OxidesBiodegradation, EnvironmentalPII Nitrogen Regulatory Proteins