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      "statement": "# Hellriegel and Wilfarth: legumes, nodules and nitrogen gain\n\nCompared grasses and legumes under controlled nitrogen nutrition and linked legume nitrogen gain with root nodules and a living symbiotic agent.\n\n## Scientific scope\n\nThe 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.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nHermann Hellriegel; Hermann Wilfarth\n\nThe named authors contributed to this scoped work; individual effort shares and later applications are not assigned by the byline.\n\n\n\n## Original sources\n\n- [Hellriegel and Wilfarth, Untersuchungen über die Stickstoffnahrung (1888)](https://www.biodiversitylibrary.org/bibliography/27102)\n- [Hellriegel, 1889 report in Berichte der Deutschen Botanischen Gesellschaft](https://www.zobodat.at/pdf/Ber-Deutschen-Bot-Ges_7_0138-0143.pdf)\n",
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