Data/hora: 16/06/2024 08:11:54

Biblioteca(s): | Epagri-Sede.
Data corrente: | 28/11/2018
Data da última atualização: | 28/11/2018
Autoria: | WURZ, D. A.; ALLEBRANDT, R.; BEM, B. P.; MARCON FILHO, J. L.; BRIGHENTI, A. F.; RUFATO, L.; KRETZSCHMAR, A. A.
Título: | EFFECT OF PROHEXADIONE-CA ON CABERNET SAUVIGNON VIGOR REDUCTION IN SOUTHERN BRAZIL.
Ano de publicação: | 2018
Fonte/Imprenta: | In: WORLD CONGRESS OF VINE AND WINE, 41., 2018, Punta del Este. Abstracts... Punta del Este, Uruguai: OIV, 2018. p. 303-305.
Idioma: | Inglês
Conteúdo: | The high-altitude regions of Santa Catarina State present as main characteristic longer phenological cycles in comparison to other Brazilian wine producing regions, resulting in wines that have quality in color and aroma differing them from wines elaborated in other regions. However, these regions present edaphoclimatic conditions that result in excessive vegetative growth, being necessary canopy adjustments to promote the vineyard balance. In this context, we are looking for growth regulators that have an effect on reduction of vine vigor, in order to reduce excessive management interventions, which end up increasing production costs. The plant growth regulator Prohexadione-Ca (ProCa) is an inhibitor of gibberellin biosynthesis that reduces vegetative growth, and may be a quick response alternative to balance vine vigor. The objective of this work was to evaluate the effect of different application timings and concentrations of ProCa on vegetative growth of Cabernet Sauvignon. The present study was carried out in vintage 2015, in a commercial vineyard, located in the city of São Joaquim - Santa Catarina State, Brazil. The experimental design was a randomized block design with four blocks and five plants per plot. The commercial product Viviful® (27.5% ProCa) was used. The treatments were applied with a powered backpack sprayer over plant canopy, during the phenological stages: single flowers separated, full bloom and 15 days after full bloom, at concentrations of 0, 250 and 500 mg/L. The measurement of balance between vegetative and productive growth was performed through the relationships between production per leaf area ratio (kg/m²). To evaluate the vegetative vigor, the length of 10 shoots per plot was measured at the end of growing season. It was evaluated the increment of vegetative growth through the formula: Increment (%) = ((Final length x 100)/Initial shoot length) -100; and inter node length, by dividing the final shoot length by the number of buds. The harvest date was determined according to the winery standards, on April 2, 2015, being evaluated the variables: productivity, soluble solids, total acidity, pH, total polyphenols and total anthocyanins. When ProCa is applied in single flowers separated, plants presented more expressive reduction in shoot growth in relation to control, either at dose of 500 mg/L or with 250 mg/L applied in single flowers separated + 250 mg/L at full bloom. It was observed a reduction in inter node length, in plants treated with 500 mg/L of ProCa applied during single flowers separated or full bloom, as well as the combined treatment of 250 mg/L + 250 mg/L applied in full bloom and 15 days after full bloom. The productive indices of Cabernet Sauvignon, except the number of clusters per plant, were affected by the application of ProCa. The application of ProCa reduced the productivity in all treatments, except in 500 mg/L 15 days after full bloom and 250 mg/L at single flowers separated + 15 days after full bloom. Production per leaf area ratio was lower for the control and single applications of ProCa. The combined applications of ProCa resulted in plants with better production per leaf area ratio. The application of ProCa at concentrations and timings used in both trials did not influence the technological maturity (soluble solids, acidity and pH) of Cabernet Sauvignon. It was concluded that application of ProCa had an effect reducing vine vigor, without affect berries chemical composition.
Palavras-Chave: | berries chemical composition; gibberellin biosynthesis; shoot growth.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_41701.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (103054-1) - UPC - PL - DD -  -  -  - DIS