Hellriegel and Wilfarth: legumes, nodules and nitrogen gain

What changed

Legume nitrogen gain became an experimentally localized biological symbiosis problem rather than an unexplained crop anomaly.

Scientific scope

The 1888 joint monograph with detailed claims checked in an 1889 report; free-living fixation is excluded.

Evidence

The linked sources identify this contribution and its scope. WRS has not independently reconstructed the scientific claims. The joint monograph is dated 1888. Detailed experimental statements checked in a 1889 report are cited to that report, not retroactively treated as passages read in the 1888 volume. Free-living fixation is separate.

Contributors

• Hermann Hellriegel · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.
• Hermann Wilfarth · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.

• Hellriegel and Wilfarth, Untersuchungen über die Stickstoffnahrung (1888)
• Hellriegel, 1889 report in Berichte der Deutschen Botanischen Gesellschaft

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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