Data/hora: 07/06/2024 09:42:28

Biblioteca(s): | Epagri-Sede.
Tipo da produção científica: | Resumo em Anais de Congresso
Data corrente: | 28/11/2018
Data da última atualização: | 28/11/2018
Autoria: | WURZ, D. A.; ALLEBRANDT, R.; REINEHR, J.; CANOSSA, A.; BEM, B. P.; BONIN, B.; BRIGHENTI, A. F.; RUFATO, L.; PASA, M. S.
Título: | BUD LOAD INFLUENCES SOLAR RADIATION INTERCEPTION AND BUD FERTILITY OF CABERNET FRANC GRAPEVINE.
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. 301-303.
Idioma: | Inglês
Conteúdo: | The number of buds remaining in shoots or spurs after pruning will determine the leaf area and the number of grape clusters. Several studies have reported differences, depending on the intensity and type of pruning, on vegetative vigor and final composition of grape berries. The adaptive processes by which the vines respond to the increase in buds number still generate doubts, mainly in relation to its effect on solar radiation interception and consequently the buds fertility in the following years. In this context, the objective of this work is to evaluate the effect of bud load on solar radiation interception and bud fertility of Cabernet Franc grapevine. This experiment was conducted during the 2016/2017 vintage, in a commercial vineyard, located in the city of São Joaquim, São Catarina State, Southern Brazil, at 1230 meters above sea level. Cabernet Franc plants grafted on the 'Paulsen 1103' rootstock were used. The treatments consisted of four different bud loads: 15, 30, 50 and 75 buds/plant. Pruning was performed on September 08, 2016. It was left 8, 15, 25 spurs with two buds each for treatments 15, 30 and 50 buds per plant, and for the treatment 75 buds per plant, 30 spurs with two buds were left, and two shoots with 8 buds each, therefore, this treatment was pruned in a mixed pruning system, characterized by the presence of spurs and shoots. For the evaluation of bud fertility, 20 shoots of the year from each treatment were collected during deep dormancy phase, after bud maturation, during the winter of 2017. The buds were individualized and separated according to their positions in the shoot, as basal buds (1st to 3rd), medium buds (4th to 7th) and apical buds (8th to 10th). Each segment of the shoot containing a bud was placed in styrofoam trays with hydrated phenolic foam. The trays were placed in a chamber with controlled temperature, photoperiod and humidity (Fitotron) with 60% relative humidity, temperature of 20°C and 14 hours of light per day with intensity of 300-400 &#956;E/m2s. To evaluate the interception of photosynthetically active radiation, an AccuPAR ceptometer (LP-80 Decagon, USA) was used. The measurements were carried out at noon, at the phenological stage of pea sized berry, which coincides with the period of grapevine floral induction, and the measurement was carried out parallel to vegetative canopy of Cabernet Franc grapevine. The experimental design was a randomized block design with four blocks and five plants per plot. The data were submitted to analysis of variance (ANOVA) and compared by Tukey test (p <0.05). The different bud loads left on Cabernet Franc plants influenced the bud fertility. A reduction in bud fertility (% fertile buds) was observed in in basal and median buds of plants left with 50 and 75 buds/plant. In the evaluation of apical buds, a reduction in bud fertility (% fertile buds) was observed only for the load of 30 buds, not statistically differing from the load of 75 buds/plant. In general, a reduction in the number of clusters per bud was observed with the increase of bud load. In the evaluation of basal buds, we observed on average 1.4, 1.3 and 1.2 clusters per bud for the loads of 15, 30 and 50 buds/plant, while for 75 buds/plant, it was observed only 0.8 cluster per bud on average. Similar behavior was observed in median buds, it was observed on average 1.8, 1.7 and 1.5 clusters per bud, while for 75 buds/plant, it presented 1.1 clusters per bud. For buds located at the distal position of shoot, no effect of bud load on bud fertility (clusters per bud) was observed, varying from 1.8 to 1.4 clusters per bud, for loads of 15 to 75 buds/plant, respectively. Regarding the interception of solar radiation, it was observed that the load of 15 buds/plant presented the highest solar radiation interception, with a value of 723.97 &#956;mol/m2s, not statistically differing from 30 buds/plant.
Palavras-Chave: | AccuPAR ceptometer; fertile buds; solar radiation.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_41699.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (103053-1) - UPC - PL - DD -  -  -  - DIS