RESUMO -A busca por uma viticultura mais sustentável exige o estudo de fontes alternativas de nutrientes que causem menor impacto ambiental. Neste contexto, este trabalho teve como objetivo avaliar o efeito de diferentes doses de cinzas vegetais e esterco bovino no desenvolvimento de videiras cv. Isabel. As doses utilizadas foram: 0; 750;1.500 e 2.250 g planta -1 de cinzas vegetais e 0; 5 e 10 kg planta -1 de esterco bovino, em esquema fatorial 4x3, com 12 tratamentos, cinco repetições e duas plantas por parcela. Nos dois primeiros ciclos de desenvolvimento vegetativo, foram avaliados o diâmetro dos ramos e o diâmetro do tronco e, no segundo ciclo, foi avaliado o índice de área foliar e realizadas as análises químicas de teores foliares de nutrientes. Houve efeitos positivos dos tratamentos para todas as variáveis estudadas, com mais evidência para as avaliações de índice de área foliar. De modo geral, para a maioria das variáveis, a dose de 5 kg planta -1 de esterco teve os melhores resultados, acrescido de 750 ou 1.500 g planta -1 de cinzas vegetais, ou o uso exclusivo de 10 kg planta -1 de esterco bovino. No entanto, este último tratamento aumentou excessivamente o conteúdo de N, o que poderia ser prejudicial às plantas. Concluiu-se que as duas fontes podem ser usadas de maneira a suprir as exigências nutricionais de plantas jovens de videira, necessitando, dependendo das condições de solo, de uma suplementação com potássio e cálcio. Termos para indexação: Vitis labrusca L., adubação orgânica, nutrição mineral, agroecologia. FERTILIZATION IN ORGANIC VINEYARD CV. ISABEL USING WOOD ASH AND CATTLE MANUREABSTRACT-The search for a more sustainable viticulture requires the study of alternative sources that causes less environmental impact. This study aimed to evaluate the effect of different doses of wood ashes and cattle manure on the vegetative growth of grapevines cv. Isabella. The following doses were used: 0, 750, 1500, 2250 g plant -1 of wood ashes and 0, 5 and 10 kg plant -1 of cattle manure, in a factorial scheme 4x3, with 12 treatments, five replications and two plant per plot. In the first two vegetative cycles, it was evaluated the diameter of canes and trunk and; on the second cycle, it was evaluated the leaf area index and carried out the chemical analysis of nutrients leaf content. It was verified positive effects of treatments for all variables studied, with more evidence for the leaf area index evaluations. In general, for the most variables, the dose of 5 kg plant -1 of cattle manure attained the best results, added to 750 or 1500 g plant -1 of wood ashes, or the exclusive use of 10 kg plant -1 of cattle manure. Nevertheless, this last treatment increased excessively the N content, what could be harmful to plants. It was concluded that the two sources could be used to supply the nutritional exigencies of young vines, needing, depending on soil conditions, a supplement with potassium and calcium.
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