Aplicação de cianamida hidrogenada e Budbreaker® na quebra da dormência e produção de BRS Cora (Vitis labrusca L.), submetida a poda mista

The objective of the work was to evaluate the effect of applying Dormex® and Budbreaker® on breaking dormancy and producing the cultivar BRS Cora (Muscat Belly A x H. 65.9.14Vitis) grown in a trellis system, in the region of Pinto Bandeira, Serra Gaúcha. A completely randomized design was used in a scheme with six treatments, as follows: T1 - control without application of sprouting inducer; T2, T3 and T4 - concentration of 1, 2 and 3% of Budbreaker®, respectively, and T5 and T6, concentration of 4 and 6% of Dormex® (hydrogenated cyanamide), respectively; 2% mineral oil was applied to all levels of sprouting inducers. The response variables were: production per plant, bunch mass and number of bunches; sprouting index and fertility, as well as physical and chemical characteristics, the content of soluble solids, considering evaluation in sticks and spurs. There was no response to the application of sprouting inducers, considering the conditions of high sum of cold hours that occurred in the winter of 2022, which together with the low cold requirement of the cultivar BRS Cora (Vitis labrusca L.), benefits the sprouting index , both in the sticks and spurs. Production reached values between 41 and 54 tons/ha and the solids content varied from 15 to 16, considered adequate for the productive characteristics of the variety and the conditions under which the experiment was carried out.