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espanolRESUMEN Los vinedos ubicados en regiones altas poseen suelos con alto contenido de materia organica. Sin embargo, debido a la baja temperatura se espera menor mineralizacion de la materia organica. De esta forma, los suelos pueden proporcionar menos cantidad de nitrogeno (N) mineral, respecto a los requerimientos de la vid. Por eso, es necesaria la aplicacion de nitrogeno que puede afectar la productividad de la vid y la composicion de la uva. Este estudio tuvo como objetivo evaluar la productividad y la composicion del mosto de la vid sometido a la aplicacion de N en suelos con alto contenido de materia organica y la relacion con la temperatura y la pluviometria. El estudio fue realizado durante las campanas de los anos 2011/12, 2012/13 y 2013/14, en un vinedo ubicado en el municipio de Agua Doce, Santa Catarina, region sur de Brasil. Los tratamientos fueron diferentes dosis de N (0, 20, 40, 80 e 120 kg N ha-1), suministrados con urea. La dosis de maxima eficiencia tecnica en la vid Cabernet Sauvignon fue alcanzada con 46 kg N ha-1 ano-1 en suelos con alto contenido de materia organica. El contenido de nitrogeno en las hojas fue un parametro sensible a la aplicacion de dosis de N en el suelo es sensible a la distribucion de las lluvias. El N reduce el contenido de solidos solubles totales en el mosto. Con base en los principales componentes analizados, los resultados indican una correlacion entre el contenido de nitrogeno total en las hojas y la precipitacion acumulada, asi como entre los rendimientos y la temperatura. EnglishABSTRACT It is common for vineyards in regions of high altitude to have high organic matter content in soil. Furthermore, reduced miner alization of organic matter and decomposing residues is expected because of the low temperatures. Thus, soils may not provide enough mineral nitrogen (N) to meet the needs of the grapevines and so the application of N sources is necessary, but may affect yield and must composition. The study aimed to evaluate yield and must composition of grapevines subjected to N application in soil with high organic matter content and the relationship with temperature and rainfall. The study was conducted in crops sea sons 2011/12, 2012/13 and 2013/14 in a vineyard located in the city of Agua Doce, state of Santa Catarina, southern Brazil. The treatments consisted of N doses (0, 20, 40, 80 and 120 kg N ha-1) supplied via urea. Leaves opposite to the cluster were collected at full flowering and at veraison. Afterwards, the leaves were dried, ground and submitted to N analysis. Parameters of yield and must composition were evaluated. The dose of maximum technical efficiency in Cabernet Sauvignon grapevines was reached with 46 kg N ha-1 year-1 in crop season 2012/13. Leaf N content was a sensitive parameter to the application of N doses in the soil and underwent seasonal variation in relation to rainfall distribution. The N doses reduced total soluble solids (TSS) contents in the must. Based on principal component analysis, we found a correlation between total N content in leaf and accumulated rainfall, as well as between yield and temperature.

Yield and must composition of 'Cabernet Sauvignon' grapevines subjected to nitrogen application in soil with high organic matter content