PhosphorusPhosphorus IsotopesIsotopesPhosphorus, DietaryIsotope LabelingNitrogen IsotopesOxygen IsotopesCarbon IsotopesPhosphorus CompoundsNitrogen FixationNitrogen CompoundsNitrogen CycleBlood Urea NitrogenNitrogen DioxideZinc IsotopesPhosphatesSulfur IsotopesCarbonFertilizersPhosphorus Metabolism DisordersDeuteriumSoilReactive Nitrogen SpeciesMineralsIron Isotopes6-PhytaseNitrogenParathyroid HormoneBiomassHyperphosphatemiaCalcium, DietaryNitrogen OxidesPII Nitrogen Regulatory ProteinsStrontium IsotopesCalciumDietEutrophicationNitratesPlant RootsAmmoniaMagnetic Resonance SpectroscopyRadioisotope Dilution TechniqueAnimal FeedQuaternary Ammonium CompoundsPhytic AcidMass SpectrometryAmino AcidsKineticsEcosystemPlant LeavesUreaGeologic SedimentsHydrogen-Ion ConcentrationHypophosphatemiaManurePlant ShootsBone and BonesAbsorptionIndicator Dilution TechniquesSoybeansSewageDigestionFecesIntestinal AbsorptionFresh WaterMagnesiumSymbiosisGlutamate-Ammonia LigaseGas Chromatography-Mass SpectrometryBacteriaOxidation-ReductionSulfurCalcitriolAnimal Nutritional Physiological PhenomenaAlkaline PhosphatasePhosphitesTime FactorsNephrocalcinosisPolyphosphatesMolecular Sequence DataKidney Failure, ChronicHyperparathyroidism, SecondaryPhotosynthesisNutritional RequirementsElectron Probe MicroanalysisFood AdditivesHydrogenRenal DialysisPhytoplanktonAtmosphereSwineAgricultureRicketsNitrogen Mustard CompoundsWaterCarbon DioxideMycorrhizaeElementsCulture MediaSoil Microbiology