科研之友
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摘要
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 (v4-3, v4-4, v4-5, v4-6, v4-7, v4-8, v4-9 e v4-10), 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.
