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    Why and how to estimate the cost of symbiotic N2 fixation? A progressive approach based on the use of 14C and l5N isotopes

    The process of symbiotic nitrogen fixation, though of obvious advantage to legumes in situations in which nitrogen is limiting, results in substantial penalty to the host plant in terms of cost of maintenance,...

    F. R. Warembourg, C. Roumet in Ecology of Arable Land — Perspectives and Challenges (1989)