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The aim of this study was to evaluate the agronomic performance of sunflower (Helianthus annuus L.) in vegetative period according to the application of nitrogen in cover. The experiment was carried out in a greenhouse at the State University of Maringá, adopting randomized blocks design with four treatments (T1: without N; T2: 40; T3: 80 and T4: 120 kg ha of N), and eight replications. Cultivation was carried out in polyethylene pots (5 dm) containing red latosol, keeping one plant per unit. At sowing, it was use 40 kg ha of P2O5, 80 kg ha -1 of K2O and 2 kg ha -1 of B. The superficial incorporation of nitrogen fertilization carried out at V8 stage. For nutritional analysis, leaves from the upper third sample at stage R4 and evaluations made regarding plant height, lap diameter, number of leaves and plant dry matter at the R5 stage. The dynamics of nutrient accumulation presented different responses, and the accumulation of leaf N can be represented by the equation Y = -1.5725x2 + 10.13x + 32.092, with R2 = 0.91. There was a significant effect on dry matter accumulation of the aerial part, with better result obtained between 78 and 91.5 kg ha of N in the cover.

NUTRIENTES E BIOMASSA NO CICLO VEGETATIVO DO GIRASSOL EM FUNÇÃO DO NITROGÊNIO EM COBERTURA