Maintenance fertilization in grapevines cv. Bordô using wood ashes and cattle manure in organic system

Abstract

This assay aimed to evaluate the effects of the superficial application of different doses of wood ashes and cattle manure, on vegetative growth and production of grapevines cv. Bordô. The doses used were 0, 750, 1,500 and 2,250 g plant-1 of wood ashes and 0, 5 and 10 kg plant-1 of cattle manure, in factorial scheme 4 x 3 (doses of ash x manure doses). During two years, the following variables were evaluated: diameter of the trunk and canes, leaf area index, yield, mean weight of cluster, number of clusters and macro and micronutrients contents in leaf. There were positive effects of the treatments for all variables, without, however, changing the nutritional status in terms of contents of elements in leaves. In general, for the majority of the variables, the treatment with 5 kg plant-1 of cattle manure added to 1,500 kg plant-1 of wood ashes, allowed to achieve the best results, with increments in leaf area index (38-71%) and yield (106-167%). The two sources can be used to supply nutritional demands of grapevines in production, needing, nevertheless, a supplementation with other sources.