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Abstract
Morphogenic and structural traits of Brachiaria brizantha cv. Marandu submitted to different levels of Nitrogen and frequency harvest. 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.
Highlights
Segundo Lemaire (1997), o pasto em condição vegetativa pode ser definido pela caracterização e combinação das variáveis morfogênicas, sendo o aparecimento foliar, o alongamento foliar e a duração da vida das folhas as três características mais importantes
Marandu submitted to different levels of Nitrogen
every 14 days and F2 = cuts in every 28 days
Summary
Segundo Lemaire (1997), o pasto em condição vegetativa pode ser definido pela caracterização e combinação das variáveis morfogênicas, sendo o aparecimento foliar, o alongamento foliar e a duração da vida das folhas as três características mais importantes. Para avaliar o efeito dos cortes e das doses de N sobre a TapF e TalF de cada freqüência de corte, foi efetuada uma análise multivariada com medidas repetidas, utilizando-se procedimentos do programa SAS (1990), pois quando se tomam medidas repetidas em ocasiões sucessivas sobre a mesma unidade experimental, em geral, estas não satisfazem as pressuposições exigidas para uma análise univariada, em que se adota o esquema de parcelas subdivididas, nas quais os tratamentos constituem as parcelas e os diferentes tempos as subparcelas. Estimativa da média das freqüências 1 e 2 da taxa de aparecimento foliar (TapF) da Brachiaria brizantha cv Marandu, em função das doses de nitrogênio (N).
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