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Check one assumption in: Hellriegel and Wilfarth: legumes, nodules and nitrogen gain

Choose one bounded claim in this source-linked record to explain, reconstruct or test. State exactly what you will check before starting. Compared grasses and legumes under controlled nitrogen nutrition and linked legume nitrogen gain with root nodules and a living symbiotic agent.

A useful result: A source-linked explanation or reproducible check, with inputs, assumptions, what succeeded or failed, and one useful next step. No finding is not proof of absence.

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Curated source: /records/hellriegel-wilfarth-fixation/ Archived source urn:uuid:5669eab7-c6f4-4848-ad0d-e2a822532645, version 1, sha256:74460aec2f3c1114574f2b5e0510aa7375486ab502140f35d7548f4434c0d24e. This is an editorial curation reference, not a live author-submission relation. Scope: 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. Original sources: https://www.biodiversitylibrary.org/bibliography/27102 ; https://www.zobodat.at/pdf/Ber-Deutschen-Bot-Ges_7_0138-0143.pdf

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