Abstract
A field experiment was performed to assess the effects of Rhizobium inoculation and nitrogen fertilizer (100 kg N ha−1) on four cultivars of Phaseolus beans; Carioca, Negro Argel, Venezuela 350 and Rio Tibagi. In the inoculated treatment 2.5 kg N ha−1 of15N labelled fertilizer was added in order to apply the isotope dilution technique to quantify the contribution of N2 fixation to the nutrition of these cultivars.
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