<b>Nitrogen fertilization of Cabernet Sauvignon grapevines: yield, total nitrogen content in the leaves and must composition

Abstract

ABSTRACT. Grapevines grown on sandy soils are subjected to the application of supplemental nitrogen (N); however, there is little information available regarding the impact of these applications on yield, plant nutritional state and must composition. The aim of this study was to evaluate the yield, nutritional state and must composition of grapevines subjected to N fertilization. Cabernet Sauvignon grapevines were subjected to annual applications of 0, 10, 15, 20, 40, 80 and . The application of N increased the nutrient content in the leaf collected at full flowering, but it had little effect on the total nutrient content in the must, and it did not affect the enological characteristics of the must, such as soluble solids, pH, total acidity, malic acid and tartaric acid. . A aplicação de N aumentou o teor do nutriente na folha coletada no pleno florescimento, mas pouco afetou o teor de nutrientes totais no mosto e não interferiu os atributos enológicos do mosto, como os sólidos solúveis, pH, acidez total e ácido málico e tartárico.Palavras-chaves: ureia, análise foliar, componentes de produção, Vitis vinifera.

Performance of reflectance indices and of a handheld device for estimating in‐field the nitrogen status of grapevine leaves

“…This might explain why results on grapevine leaf N presented here are in contrast to some other N fertilisation field studies conducted over a shorter term [e.g. Lorensini et al ()]. Our results show a clear effect of N fertilisation on Chl, Car and N concentration in grapevine leaves.…”

Phosphorus forms in leaves and their relationships with must composition and yield in grapevines

“…This procedure comes from the belief that increased P content available in the soil indicates an increase of P content within the plant, which is diagnosed by analyzing leaves, since it is an annual organ, with intense cellular division, and increased dry matter production during the vegetative growth and production stages (Lorensini et al, 2015).…”

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

“…Thus, the amount of N available in the soil and the internal nitrogen reserves may have been sufficient for the plants, contrasting with the results found in the present work with Isabel-Precoce grapevines under local conditions. Lorensini et al (2015) evaluated Cabernet Sauvignon grapevines with annual application of N rates (0,10,15,20,40,80, and 120 kg ha -1 ) and found a quadratic effect for NBP, with the best results obtained with the N rate of 20 kg ha -1 . Casali et al (2015) evaluated the productivity of Niagara Rosada grapevines with increasing bovine manure rates (0, 9, 18, 36, and 72 L plant -1 year -1 ) and also found a quadratic effect for NBP, and the best results were obtained with the use of 9 L manure plant -1 ; higher N rates reduced the NBP, and the authors attributed this result to the excess of N provided by the organic fertilizer.…”

“…Brunetto et al (2009) evaluated Cabernet Sauvignon grapevines subjected to N fertilization and found the highest yields with applications of 15 to 30 kg ha -1 N, thus, under the conditions of the study, the highest N rates provide no increase in plant production. Lorensini et al (2015) evaluated the application of increasing N rates in Cabernet Sauvignon grapevines in three crop seasons and found a quadratic response for PPP, with the best results found in the N rate of 20 kg ha -1 . They attribute this result to the higher NBP and bunch weight, as found in the present work for Isabel-Precoce grapevines.…”

“…The use of N affects the vegetative growth of the grapevine, production and composition of the berries, and the final quality of the fruits (BRUNETTO et al, 2009). N deficiency reduces productivity, however, N excess decreases fruit quality by stimulating competition between vegetative and reproductive activity of the plant (LORENSINI et al, 2015).…”