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Fertilization in organic vineyard cv. Isabel using wood ash and cattle manure

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.

Vitis labrusca L.; organic fertilization; mineral nutrition; agroecology


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