The objective of this work was to evaluate the effect of nitrogen topdressing in common bean agronomic performance in no tillage and conventional tillage system. The work was developed during two seasons, in different years, in a Rhodic Kandiudox soil, using the succession black oat/pear millet/common bean cv. Perola (fall-winter, spring and summer, respectively), in no irrigated conditions. The experimental design was the randomized blocks in split plot design, with four replications. The parcels were represented by different soil tillage (conventional and no tillage), and the subparcels by doses of nitrogen applied in topdressing (0, 40, 80, 120, and 160 kg ha-1 of N); urea was used as source of N. Common bean crop has distinct responses to the doses of nitrogen in topdressing through the years of cultivation, with higher grain yield in the second year of the succession black oat/pearl millet/bean, needing, however, higher doses in no tillage system.
Phaseolus vulgaris; doses of nitrogen; soil tillage system; productivity
