época de aplica？？o de nitrogênio no milho cultivado em sucess？o à aveia preta no sistema plantio direto

this paper has as main goal the evaluation of lhe effect of nitrogen application on the yield of no tillage com crop, planted over black oats. experiments were conducted m the agricultural year of 1996/97 in three experimental units of the abc foundation located in the campos gerais region of the state of paraná. the experimental design was a split-plot randomized block, being the plot treatments the two doses of n applied to the oats crop (o and 30kg há-1 in the planting time) as the main plots and as the time of application of n in the com crop (no nitrogen; 30kg há-1 in the planting plus 90kg há-1 broadcasting in the 6a leaf time; 90kg há-1 during the oats crop management plus 30kg há-1 in the com planting; and 120kg há-1 during the oats crop management plus 30kg há-1 in the com planting) as split plot treatments. it was verified the oats crop fertilization dia not influenced com yield. the com yield was not affected by anticipated n application usually used in corn's broadcasting.