01692naa a2200289 a 450000100080000000500110000800800410001910000150006024501610007526000090023652008930024565000080113865000100114665000220115665000150117865000120119365000120120565000120121765000160122965000160124565000230126165300080128465300250129270000220131770000150133977300480135416183621995-06-27       1993    bl uuuu     u00u1 u    #d1 aMULLER, S.  aEffect of different levels of mineral nitrogen on nodulation and N2 fixation of two cultivars of common bean (Phaseolus vulgaris L.).h[electronic resource]  c1993  aAn experiment was conducted under greenhouse conditions to evaluate the effect of mineral nitrogen on N 2 fixation of two cultivars of Phaseolus vulgaris L., Puebla 152 and Negro Argel. Nitrogen application was 0, 2.5, 12.5 and 25 mg N kg -1 of a vermiculite-sand-mixture at planting time. Shoot and root growth were elevated by nitrogen application at all growth stages. During vegetative growth (V 5) nodule dry weight and nitrogenase activity (acetylene reducing activity) per plant were reduced by nitrogen supply in both cultivars, but less in Negro Argel than in Puebla 152. At later stages nodulation in nitrogen-treated Puebla 152 did not differ from that in non-treated plants, whereas increased nodule number was found in Negro Argel at high nitrogen levels. The influence of mineral N on the total amount of nitrogen fixed in the two bean cultivars was only slightly different.  aAra  aBeans  aNitrogen fixation  aNodulation  aAmônia  aFeijão  aNitrato  aNitrogênio  aNodulação  aPhaseolus Vulgaris  aFBN  aGenótipo da planata1 aPEREIRA, P. A. A.1 aMARTIN, P.  tPlant Soilgv. 152, n. 1, p. 139-143, 1993.