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A taxa de aparecimento foliar (TapF), taxa de alongamento foliar (TAlF), taxa de senescência foliar (TSF), tamanho médio de folhas (TMF) e Densidade de Perfilhos (DP) da Brachiaria brizantha cv. Marandu submetida a diferentes doses de nitrogênio – (N) (0, 45, 90, 180 e 360 mg dm-3) e duas freqüências de corte (F1 = cortes a cada 14 dias e F2 = cortes cada 28 dias) foram avaliadas em experimento disposto no delineamento em blocos casualizados, em vasos, em casa-de-vegetação. Não foi encontrada interação significativa entre a freqüência de corte e doses de N para a TApF (P > 0,01). Contudo, ela foi incrementada (P < 0,01) com o aumento da freqüência de corte e com o incremento das doses de N. Houve efeito das doses de N (P < 0,01) sobre a TAlF. Apenas o efeito da interação entre a freqüência de corte e as doses de N sobre o TMF e a DP não foi significativo (P > 0,01), sendo os cortes freqüentes negativo (P < 0,01) e o incremento das doses de N positivo (P < 0,01) sobre o TMF. Desfolhações a cada duas semanas foram extremamente estressantes para as plantas, debilitando-as, isto foi amenizado pelo elevado suprimento de N.Leaf appearance rate (LAR), leaf elongation rate (LER), average leaf size (ALS) and tillers density (TD) of Brachiaria brizantha cv. Marandu, submitted to different levels of nitrogen – (N) (0, 45, 90, 180 e 360 mg dm-3) and frequency harvest (F1 = cuts every 14 days and F2 = cuts in every 28 days) were evaluated, in a randomized block experiment, disposed in pots in a greenhouse. There was no significant effect of the interaction between frequency harvest and the levels of N on LAR. However, it was increased according to the increase of the frequency harvest and to the nitrogen levels. The effect of nitrogen levels was significant on LAR. Only the effect of the interaction between the frequency harvest and the levels of nitrogen on ALS and TD was not significant, being the effect of the frequency harvest negative and the effect of the nitrogen levels positive on ALS. Defoliation in every two weeks was extremely stressor debilitating the plants, which was eased with high supply of nitrogen

acta scientiarum. agronomy

Características morfogênicas e estruturais da &lt;em&gt;Brachiaria brizantha&lt;/em&gt; cv. Marandu submetida a diferentes doses de nitrogênio e freqüências de cortes