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Seeds with a high concentration of P or Mo can improve the growth and N accumulation of the common bean (Phaseolus vulgaris L.), but the effect of enriched seeds on biological N2 fixation has not been established yet. This study aimed to evaluate the effect of seeds enriched with P and Mo on growth and biological N2 fixation of the common bean by the 15N isotope dilution technique. An experiment was carried out in pots in a 2 x 3 x 2 x 2 factorial design in randomized blocks with four replications, comprising two levels of soil applied P (0 and 80 mg kg-1), three N sources (without N, inoculated with rhizobia, and mineral N), two seed P concentrations (low and high), and two seed Mo concentrations (low and high). Non-nodulating bean and sorghum were used as non-fixing crops. The substrate was 5.0 kg of a Red Latosol (Oxisol) previously enriched with 15N and mixed with 5.0 kg of sand. Plants were harvested 41 days after emergence. Seeds with high P concentration increased the growth and N in shoots, particularly in inoculated plants at lower applied P levels. Inoculated plants raised from high P seeds showed improved nodulation at both soil P levels. Higher soil P levels increased the percentage of N derived from the atmosphere (%Ndfa) in bean leaves. Inoculation with the selected strains increased the %Ndfa. High seed P increased the %Ndfa in inoculated plants at lower soil P levels. High seed Mo increased the %Ndfa at lower soil P levels in plants that did not receive inoculation or mineral N. It is concluded that high seed P concentration increases the growth, N accumulation and the contribution of the biological N2 fixation in the common bean, particularly in inoculated plants grown at lower soil P availability. Sementes com altos teores de P ou Mo podem estimular o crescimento e a acumulação de N no feijoeiro (Phaseolus vulgaris L.), mas o efeito de sementes enriquecidas na fixação biológica de N2 ainda não foi estabelecido. O presente estudo teve por objetivo avaliar o efeito de sementes enriquecidas com P e Mo no crescimento e na fixação biológica de N2 do feijoeiro por meio da técnica de diluição isotópica de 15N. Foi conduzido um experimento em vasos em esquema fatorial 2 x 3 x 2 x 2 em blocos casualizados com quatro repetições, combinando duas doses aplicadas de P (0 e 80 mg kg-1), três fontes de N (sem N, inoculado com rizóbio e N mineral), dois teores de P na semente (baixo e alto) e dois teores de Mo na semente (baixo e alto). O feijoeiro não nodulante e sorgo foram utilizados como controles não fixadores. O substrato constituiu-se de 5,0 kg de Latossolo Vermelho previamente enriquecido com 15N misturado com 5,0 kg de areia. As plantas foram colhidas aos 41 dias após emergência. Sementes com alto teor de P aumentaram a acumulação de biomassa e de N da parte aérea, principalmente nas plantas inoculadas na menor dose de P no solo, e a massa de nódulos nas plantas inoculadas nas duas doses de P no solo. A maior dose de P no solo aumentou a porcentagem de N derivado da atmosfera (%Ndfa) nas folhas de feijoeiro. A inoculação com as estirpes recomendadas aumentou a %Ndfa. O alto P na semente aumentou a %Ndfa, nas plantas inoculadas sob baixo P no solo. O alto Mo na semente aumentou a %Ndfa sob baixo P no solo nas plantas que não receberam inoculação ou N mineral. Conclui-se que sementes enriquecidas com P aumentam o crescimento, a acumulação de N e a contribuição da fixação biológica de N2 em feijoeiro, particularmente em plantas inoculadas crescidas sob menor disponibilidade de P no solo

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Seeds enriched with phosphorus and molybdenum improve the contribution of biological nitrogen fixation to common bean as estimated by 15n isotope dilution