Nitrogen FixationHealth Care CostsCosts and Cost AnalysisNitrogen IsotopesNitrogen CompoundsNitrogen CycleBlood Urea NitrogenNitrogen DioxideReactive Nitrogen SpeciesDrug CostsCost of IllnessNitrogen OxidesPII Nitrogen Regulatory ProteinsCarbonAmmoniaNitratesFertilizersCost ControlQuaternary Ammonium CompoundsDirect Service CostsGlutamate-Ammonia LigaseCost SharingCost-Benefit AnalysisUreaSoilNitrogen Mustard CompoundsCost AllocationNitrogenaseSymbiosisAmino AcidsBiomassPlant RootsGlutaminePlant LeavesAcetyleneDigestionBacterial ProteinsGene Expression Regulation, BacterialAmmonium CompoundsGlutamate SynthaseAllantoinCulture MediaMolecular Sequence DataPhosphorusNitritesRoot Nodules, PlantEcosystemPoaceaeNitrate ReductaseDenitrificationPhotosynthesisAnimal FeedCyanobacteriaEnergy MetabolismModels, EconomicGenes, BacterialOxidation-ReductionTime FactorsMedicago sativaBacteriaKetoglutaric AcidsFermentationNutritional RequirementsSoil MicrobiologyAgricultureMutationCarbon DioxideAir PollutantsRhizobiumGlutamate DehydrogenaseGATA Transcription FactorsEmployer Health CostsSoybeansSinorhizobium melilotiTreesRumenGene Expression Regulation, FungalQuality-Adjusted Life YearsPlant ShootsSulfurHydrogen-Ion ConcentrationModels, BiologicalNitrificationManureFabaceaeBody WeightDietFreezingParenteral Nutrition, TotalAtmosphereAir PollutionBase SequencePlantsEnvironmental MonitoringNitrate ReductasesZea maysGasesParenteral NutritionUnited StatesOxygen