Superação da dormência em macieiras cultivar Eva com cianamida hidrogenada

Abstract

The western border of Rio Grande do Sul is one of the most important regions of the Brazilian agricultural sector, standing out flooded rice and breeding beef of cattle and sheep. During the last years the interest in temperate fruit crop has increased. But, the amount of chilling hours required for dormancy breaking of these species is insufficient. What justifies the conduct of this work, it is the viability the fruit-growing for this region, to be an alternative crop diversification, especially for small farms, Optimizing de profitability of these. Therefore the aim of this work was to evaluate different concentrations of hydrogen cyanamide (HC), wift or without 4% mineral oil (OM), on breaking dormancy of apple cv. Eva. The variables were: Percentage of shoot buds (in four branches plant-1 pre-selected), tree canopy volume, fruit diameter (mm), yield and fruit color were analyzed. In completely randomized experimental designs, were studied treatments distributed in a factorial scheme of 2 x 5 constituting the application of mineral oil (MO) (0% and 4%) combined with five different concentrations of hydrogen cyanamide (HC) (0%, 50%, 100%, 150% and 200% of the recommendation for mild climate regions), with three replications. To observe the accumulation hours of cold, data dici obtained was used wifi the IMET, which underwent Mota formula. It was verified that the use of HC associated with MO is essential for breaking dormancy. The major effect was obtained using 2.4% of CH (200% of the maker recommendation associated with OM), which was obtained 57.01% of sprouting bud, but not improving productivity.