Application of nitrogen sources on grapevines and effect on yield and must composition

Abstract

ABSTRACT-This study was carried out to evaluate the yield, total N content in leaves and must composition of grapes from the Cabernet Sauvignon variety subjected to the application of urea and organic compost. Cabernet Sauvignon grapevines in Rosário do Sul, RS, Brazil, in 2008, 2009 and 2010 were subjected to annual application of 40 kg N ha -1 in the form of organic compost and urea, and compared to unfertilized grapevines. In the 2008/09, 2009/10 and 2010/11 crop seasons, leaves were collected for analysis of total N content. At maturation of the grapes, the yield and quality attributes of the must were evaluated. The application of N sources, especially organic compost, increased the N content in the whole leaf at full flowering. Application of organic compost and urea has little effect on grape yield and does not affect the total nutrient content in the must, nor the enological attributes. Index terms: Urea, organic compost, leaf analysis, must quality, Vitis vinifera. foram coletadas folhas no pleno florescimento e na mudança da cor das bagas para a análise do teor de N total. Na maturação das uvas, foram avaliados a produção e os atributos de qualidade do mosto. A aplicação de fontes de N, especialmente composto orgânico, aumenta o teor de N na folha completa, no pleno florescimento. A aplicação de composto orgânico e de ureia pouco afeta a produção de uva e não interfere no teor de nutrientes totais no mosto nem tampouco nos atributos enológicos. Termos de indexação: Ureia, composto orgânico, análise foliar, qualidade do mosto, Vitis vinifera. APLICAÇÃO DE FONTES DE NITROGÊNIO EM VIDEIRAS E EFEITO NA PRODUÇÃO E COMPOSIÇÃO DO MOSTO RESUMO-O trabalho objetivou avaliar a produção, o teor de N total nas folhas e a composição do mosto de uvas da cultivar Cabernet

Nitrogen and Organic Fertilization on Grapevine Productivity in the Brazilian Semiarid Region

“…This result can be explained by the imbalance due to excess N available to plants. The plants had satisfactory water supply through irrigation, and ready availability of nutrients, generating optimal conditions for vegetative development to the detriment of the reproductive, because N is the element that most affects the vigor of the grapevines in production, affecting productivity factors, and quality and composition of the grape (BRUNETTO et al, 2013;MELO;CERETTA, 2016).…”

“…Rocha, Bassoi and Silva (2015) conducted a similar study using Syrah grapevines in three crop cycles and found positive results for the use of OrF in NBB only in the last cycle, however, the N rates (0, 10, 20, 40 and 80 kg ha -1 ) showed no significant effect on NBB. Brunetto et al (2013) evaluated Cabernet Sauvignon grapevines with application of 40 kg ha -1 of N, using urea and organic compost as sources of N, and found no significant difference in NBB, but reported a trend of increase for NBB with the use of the organic compound.…”

“…Several studies on grapevines using increasing N rates (BRUNETTO et al, 2009;LORENSINI et al, 2015), urea and organic fertilizer (BRUNETTO et al, 2013), and increasing rates of OrF (CASALI et al, 2015) found that excessive rates of N or organic materials hinder their production components. It was also observed in the present study; high N rates from urea (90 and 120 kg ha -1 ) or from OrF (approximately 131.0 kg ha -1 ) ( Table 3) generated excess N in the soil, causing significant decreases in the production of the grapevines.…”

Application of foliar urea to grapevines: productivity and flavour components of grapes

“…There are few publications on the effect of foliar N application on grape yield and its components, such as the number and mass of bunches per plant and berry mass (Brunetto et al 2013). Several N treatments applied to vineyard soil and leaves did not affect berry mass, bunch mass, number of bunches per plant, pruning mass and yield in a study performed in two consecutive seasons (Kelly et al 2017).…”