Nitrogen's benefit to nitrogen-fixing plants depends on which plants

A 121-experiment synthesis found a modest mean growth gain, enormous dispersion and a strong imprint of phylogeny.

Wild Lands Ecological Intelligence Editor
Wild Lands Institute · 1 November 2026

Nitrogen's benefit to nitrogen-fixing plants depends on which plants — USFWS — illustrative Madison Wetland Management District, North Dakota prairie, NOT a nitrogen-enrichment study site · Public domain (USFWS) · Rights: Public domain

Evidence: Peer-reviewed
Geography: Meta-analysis of 121 experiments, 76 N-fixing species
System: Nitrogen fixing, nutrient enrichment, plant biomass

WHAT THE EVIDENCE SAYS

Among 2,110 paired observations, nitrogen enrichment raised mean biomass 14.2%, but responses ranged from large losses to extreme gains. Intraspecific variability accounted for 26.9% and plant phylogeny 21.1% of response variation; experimental design and conditions also mattered.

WHY IT MATTERS / OUR READ

A mean response is not a fertilization prescription. Species, soil conditions and rate must come before scaling any expected effect to a working landscape.

CAVEATS / UNCERTAINTY

Experiments differ widely in duration, dose and controls; biomass is not a direct measure of biodiversity benefit or long-term nutrient-cycle recovery.

SOURCE

Nature Communications — Yao et al. (30 Oct 2026)
View original evidence ↗