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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.
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Delgado et al. (2006) studied this question.
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