Nitrogen CycleSoilNitrogenSoil MicrobiologyFertilizersBiomassSoil PollutantsEcosystemNitrogen CompoundsNitrogen FixationNitrificationDenitrificationCell CyclePlanctomycetalesQuaternary Ammonium CompoundsNitrogen IsotopesCrenarchaeotaArchaeaBacteriaAmmoniaTreesAgricultureNitrite ReductasesNitratesPhylogenyNitritesRNA, Ribosomal, 16SDNA, ArchaealSeawaterGenes, ArchaealGeologic SedimentsNitrous OxideBiodiversityOceans and SeasSoil Pollutants, RadioactiveOxidation-ReductionClimate ChangeMolecular Sequence DataSequence Analysis, DNACarbonBiodegradation, EnvironmentalPlant RootsBlood Urea NitrogenNitrogen DioxideOxidoreductasesMenstrual CycleDNA, RibosomalReactive Nitrogen SpeciesDNA, BacterialGenome, BacterialManureCell Cycle ProteinsPoaceaeNitrogen OxidesFungiPII Nitrogen Regulatory ProteinsCarbon CycleEnvironmental MonitoringCrops, AgriculturalWater