Effect of Shoot and Bunch Density on Yield and Quality of ‘Sugraone’ and ‘Thompson Seedless’ Table Grapes

Abstract

ABSTRACT-This study aimed to evaluate the effect of shoot and bunch density through thinning practices on yield components and quality of 'Thompson Seedless' and 'Sugraone' grapevines in the São Francisco River valley. The experiments were carried out during two growing seasons (2010 and 2012) in commercial vineyards of Lagoa Grande, state of Pernambuco, Brazil. Treatments were a split plot represented by three shoot densities and three bunch densities in a random block design. The yield of 'Thompson Seedless' grapevine was up to 25.9% higher in plants kept with 6 bunches.m -2 , reaching 20.7 and 27.0 kg.plant -1 , in the 2010 and 2012 crop years, respectively. Although effects on yield were not observed in 'Sugraone' cultivar, bunch and berry mass was higher in treatments with 5 bunches.m -2 and 7 shoots.m -2 , respectively, in the last production cycles. 'Thompson Seedless' grapes with greater berry firmness were harvested in 2012 in plants submitted to densities of 7 or 8 shoots.m -2 , while the contents of soluble solids and total soluble sugars were higher in grapes harvested from plants with lower shoot and bunch densities. However no effects of treatments on the contents of soluble solids were observed in 'Sugraoen' grapes. The use of 7 shoots.m -2 associated to 6 bunches.m -2 is recommended for 'Thompson Seedless' grapevines because it increased yield with no harm to fruit quality, while for 'Sugraone', densities of 7 shoots.m -2 and 5 bunches.m -2 can be used to increase the mass of bunches and berries. Index terms: Seedless grapes. Vitis vinifera L.. Shoot removal. Thinning. DENSIDADE DE RAMOS E DE CACHOS NA PRODUÇÃO E QUALIDADE DE UVAS DE MESA 'SUGRAONE' E 'THOMPSON SEEDLESS'RESUMO -Este trabalho teve como objetivo avaliar a influência de diferentes densidades de brotos e de cachos, por meio das práticas de desbrota e desbaste, sobre os componentes de produção e de qualidade dos cachos de uvas 'Sugraone' e 'Thompson Seedless' no Vale do São Francisco. Os experimentos foram realizados durante dois ciclos de produção (2010 e 2012), em vinhedos comerciais, no município de Lagoa Grande-PE. Os tratamentos estavam distribuídos em parcelas subdivididas, representadas por três densidades de brotos e três densidades de cachos, em delineamento experimental, em blocos ao acaso. A produção em 'Thompson Seedless' foi 25,9% maior em plantas mantidas com 6 cachos.m -2 , alcançando 20,7 e 27,0 kg.planta -1 , nas colheitas de 2010 e 2012, respectivamente. Na cultivar Sugraone, não houve efeitos sobre a produção por planta, embora a massa do cacho e da baga tenham sido maiores, em, pelo menos, um ciclo de produção, respectivamente, nos tratamentos com densidade de 5 cachos.m -2 e 7 brotos.m -2 . Em 'Thompson Seedless', uvas mais firmes foram colhidas em 2012, de plantas com 7 ou 8 brotos.m -2 , enquanto os teores de sólidos solúveis e de açúcares solúveis totais foram maiores nas uvas colhidas de plantas com menores densidades de brotos e cachos. Entretanto, na 'Sugraone', não se observou efeito dos tratamentos sobre ...

Cane Pruning Intensity of Vine as a Substantial Factor Influencing Physico-Chemical Attributes of Berries Cultivar ‘Regent’

“…In addition, the results of Tangolar et al (2015) indicate that sugar and organic acid content of the berries were not significantly differentiated by bud load effect. However, Leão and Lima (2017) concluded that effect of shoot and cluster density was depended on cultivars. In grapes of 'Thompson Seedless' the content of soluble solids was higher under lower shoot and bunch densities, while no impact of treatments was observed in 'Sugraoen' grapes.…”