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    acetylene reduction assay (ARA) (1)
    biological nitrogen fixation (1)
    Dorycnium (1)
    Lathyrus (1)
    legumes (1)
    lotus (1)
    N accumulation (1)
    Ornithopus (1)
    sand dunes (1)
    ¹⁵N isotope dilution technique (1)