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AgriculturePlant SciencesSoil SciencesSoil FertilitySoil Organic MatterSoil ScienceBiological Nitrogen FixationNitrogen FixationNitrogen Fixation In SoilsPlant-soil Nutrient InteractionsSoil Nutrient AvailabilitySoil-plant Nutrient RelationsMicrobial Community Contributions To Nitrogen FixationNitrogen Fixation In GrasslandsNitrogen Fixation PotentialNitrogen-fixing NodulesRhizosphere Nitrogen Fixation