Data/hora: 09/05/2024 16:16:54

Biblioteca(s): 	Epagri-Sede.	
Data corrente: 	29/11/2018	
Data da última atualização: 	29/11/2018	
Autoria: 	CIOTTA, M. N.; BRIGHENTI, A. F.; BRIGHENTI, E.; OLIVEIRA, L. S.; BRUNETTO, G.	
Título: 	PRODUCTIVITY, MUST COMPOSITION AND ALTERATION OF SOIL POTASSIUM FORMS IN A VINEYARD UNDER POTASSIUM FERTILIZATION.	
Ano de publicação: 	2018	
Fonte/Imprenta: 	In: WORLD CONGRESS OF VINE AND WINE, 41., 2018, Punta del Este. Resumos... Punta del Este, Uruguai: OIV, 2018. p. 419-421.	
Idioma: 	Inglês	
Conteúdo: 	The Brazilian Southern Region, where Santa Catarina State is located, has the largest area cultivated with grapevines (Vitis vinifera L.) in the country. Cabernet Sauvignon is the most cultivated variety, and its grape is used for red wines elaboration. However, the grape production and its composition may be affected by the doses of nutrients applied, including potassium (K), which may also alter the distribution of nutrient fractions in vineyards soil. The study aimed to assess how K fertilization may affect grape production, must composition and soil K forms in a vineyard of Cabernet Sauvignon. An experiment was carried, from 2011/12 to 2015/16 seasons, the grapevines were subjected to application of 0, 50, 100, 150 and 200 kg K2O ha-1 year-1. Leaf samples were prepared and measured for total K levels; production per plant and area, number and weight of clusters, 100 berries weight also were assessed. Levels of soluble solids (SS), pH and titratable acidity were analyzed in the must. Soil was collected from the layer at 0.0-0.20 m, analyzing the exchangeable K extracted with Mehlich-1 (all seasons) and the non-exchangeable K extracted with boiling 1N HNO3 and the total K extracted with concentrated HF, in three growing seasons (2011/12 to 2013/14). The total K levels in the leaf blades increased linearly with the increase in K dose applied to the soil. The total K levels in the blade increased from 0.51% in plants with no application of K fertilizer to 0.98% in plants with the annual addition of 200 kg K2O ha-1 year-1. Grape production failed to respond to application of K fertilizer despite the significant variations in production, which was 6.823 kg grape ha-1 year-1 in the 2010/11 and 6.035 kg grape ha-1 year-1 in 2015/16 growing season. The values of SS, pH and total titratable acidity in the must also demonstrated no effect from the application of K fertilizer in the three growing seasons. Over the years, there was an increase in exchangeable K and total K at doses of 150 and 200 kg ha-1 of K2O year-1, and at doses above 100 kg ha-1 K2O year-1 also increased K exchangeable. Thus, the analysis of the three grapevine growing seasons showed that K application to the soil had no effect on grape production and must composition, although it increased the K levels in the blade and petiole. However, the annual fractionation of soil K suggest that 100 kg K2O ha-1 year-1 is the K dose capable of maintaining the K availability to plants at more appropriate levels throughout the growing seasons.	
Palavras-Chave: 	Cabernet Sauvignon; fertilization; potassium.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
URL: 	http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_41716.pdf	
Registro original: 	Epagri-Sede (Epagri-Sede)	
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