Hydrogenated cyanamide in the budding of ‘Eva’ apple tree in a mild winter region

Cianamida hidrogenada na brotação da macieira ‘Eva’ em região de inverno ameno

Abstract

This study was carried aiming to evaluate different hydrogen cyanamide concentrations (0.00%; 0.26%; 0.52% 0.78% and 1.04%) associated with (3%) mineral oil on the bud growth of the ‘Eva’ apple tree in a high-altitude tropical climate region in the state of Minas Gerais. Sprouting percentage, fruit set: ratio between number of fruits and number of flowers (%), number of fruits per plant and flowering phenology were evaluated during the 2020 and 2021 production cycles. Even not being submitted to temperatures below 7.2°C, the ‘Eva ‘ cultivar completed its production cycle in two subsequent years. Hydrogen cyanamide application combined with mineral oil promoted increased budbreak and flowering uniformity, in addition to anticipating the beginning of flowering of the ‘Eva’ apple cultivar.

Index terms
Malus domestica; phenology; budbreak promoter; dormancy