Original research articles

Interaction effects of nitrogen and potassium fertilization on anthocyanin composition and chromatic features of Tempranillo grapes

Abstract

A factorial experiment (3 nitrogen and 3 potassium fertilization doses) was carried out in a Tempranillo vineyard located in the 'Ribera del Duero' Apellation d'Origine area (Spain) in 2000. N and K supplies caused decreases in delphinidin and petunidin monoglucoside content in grape skins. High nitrogen doses increase L* coordinate and chroma of the skins. High potassium with unbalanced nitrogen supplies enhances hue and yellow component of colour. Possible effects of N and K fertilization on the copigmentation of anthocyanins are discussed.

Authors


Rubén Delgado

Affiliation : Dept. Producción Vegetal y Recursos Forestales, Universidad de Valladolid, avenida de Madrid, 57, 34004 Palencia, Spain


María Rosa González

Affiliation : Dept. Producción Vegetal y Recursos Forestales, Universidad de Valladolid, avenida de Madrid, 57, 34004 Palencia, Spain


Pedro Martín

Affiliation : Dept. Producción Vegetal y Recursos Forestales, Universidad de Valladolid, avenida de Madrid, 57, 34004 Palencia, Spain

pmartinp@pvs.uva.es

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