Abstract
Abstract The aim of this work was to verify the effectiveness of the reapplication of bud break producers on flowering, sprouting and production of ‘Fuji Suprema’ apple trees. The experiment was carried out in an experimental orchard located in the municipality of Caçador, SC, during 2016/2017 to 2019/2020 seasons. Treatments were applied at stages B and C, and those with reapplication, from 7 to 14 days after the first application. Phenology, axillary and terminal bud break, frui set, production per plant and average fruit mass were evaluated. Phenology was advanced in relation to control with the application of bud break promoters. However, treatments applied at stage B provided greater advance in relation to applications at stage C. In axillary and terminal bud break, all treatments were superior to control. In some seasons, the sequential application of bud break promoters increased bud sprouting compared to single application treatment. There is no reduction fruit set in treatments with sequential application in relation to single application. In plant production, sequential applications did not differ from single application. The average fruit mass was not altered by the sequential application of bud break promoters.
Highlights
In Brazil, apple cultivation is located in the Southern region, in areas where the cold requirement of the main cultivars is almost never fully satisfied (PETRI et al, 2008)
Sprouting and flowering are delayed compared to regions with colder winters, with bud breaking date varying from year to year, depending on the amount of cold
Phenology was advanced in relation to control treatment with the application of bud break promoters, regardless of stage of application and sequential application
Summary
In Brazil, apple cultivation is located in the Southern region, in areas where the cold requirement of the main cultivars is almost never fully satisfied (PETRI et al, 2008). In this sense, under milder winter conditions, several artificial practices to overcome dormancy have been used in order to minimize some of the problems resulting from cold deficiency, providing adequate sprouting and flowering in the main temperate climate species, enabling production even in sub-tropical regions (BENMOUSSA et al, 2018). Sprouting and flowering are delayed compared to regions with colder winters, with bud breaking date varying from year to year, depending on the amount of cold
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