Resumen

GOMES JUNIOR, Francisco Guilhien; SA, Marco Eustáquio de  y  MURAISHI, Cid Tacaoca. Nitrogen fertilization in common bean crops under no-tillage and conventional systems. Acta Sci., Agron. (Online) [online]. 2008, vol.30, suppl., pp. 673-680. ISSN 1807-8621.  http://dx.doi.org/10.4025/actasciagron.v30i5.5967.

Nitrogen fertilizer is necessary for high yields in common bean crops and N responses under conditions of no-tillage and conventional systems are still basic needs. Thus, the objective of this research was to evaluate the effect of N application and common bean yield in no-tillage and conventional systems. The experimental design was a randomized block in a factorial scheme (2x8 + 1) with four replications. The treatments were constituted by the combination of two N doses (40 and 80 kg ha^-1) applied at side dressing at eight distinct stadia during vegetative development of the common bean (V_4-3, V_4-4, V_4-5, V_4-6, V_4-7, V_4-8, V_4-9 e V_4-10), in addition to a control plot without N in side dressing. The experiment was conducted over two years (2002 and 2003) in no-tillage on millet crop residues and conventional plow system. It was concluded that N fertilizer at the V₄ stadium of common bean promotes similar seed yields in no-tillage and conventional systems. Yield differences between no-tillage and conventional systems are inconsistent in the same agricultural area.

Palabras llave : Phaseolus vulgaris L.; mulching; nitrogen fertilizer; phenology.