Quaternary Ammonium CompoundsNitrogen FixationAmmonium SulfateAmmonium ChlorideAmmonium CompoundsNitrogen IsotopesNitrogen CompoundsAmmoniaNitrogen CycleBlood Urea NitrogenNitrogen DioxideReactive Nitrogen SpeciesNitratesAmmonium HydroxidePII Nitrogen Regulatory ProteinsGlutamate-Ammonia LigaseNitrogen OxidesCarbonFertilizersHydrogen-Ion ConcentrationNitrogenUreaAmino AcidsMethylaminesNitrogenaseGlutamineGlutamate SynthaseSoilCulture MediaPlant RootsNitritesBiomassMolecular Sequence DataSymbiosisNitrate ReductaseBacterial ProteinsKineticsNitrogen Mustard CompoundsGlutamate DehydrogenaseCation Transport ProteinsAcetyleneOxidation-ReductionNitrosomonasGene Expression Regulation, BacterialPlant LeavesKetoglutaric AcidsNitrate ReductasesDenitrificationBacteriaNitrificationTemperatureMolecular WeightPhosphorusTrimethyl Ammonium CompoundsCyanobacteriaChemical PrecipitationGlutamate Synthase (NADH)MutationAmino Acid SequenceGenes, BacterialPlant ProteinsFermentationGlutamate Dehydrogenase (NADP+)Soil MicrobiologyEcosystemRoot Nodules, PlantDigestionOxidoreductasesPhotosynthesisCarbon DioxideRhizobiumBioreactorsEscherichia coliAllantoinPoaceaeAnaerobiosisMethionine SulfoximineNitrite ReductasesGene Expression Regulation, FungalChromatography, GelGATA Transcription FactorsBiological TransportPlant ShootsAnimal FeedChromatography, Ion ExchangeBase SequenceAcetatesSeawaterFractional PrecipitationGlutamatesPlantsTime FactorsElectrophoresis, Polyacrylamide GelSubstrate SpecificityCattleSoybeansSulfurEnzyme RepressionMedicago sativaWater