Resumo

LOPES, Carlos M.; ANDRADE, Isabel; PEDROSO, Vanda  e  MARTINS, Sérgio. Empirical models for leaf area estimation of the grapevine cv. Jaen. Ciência Téc. Vitiv. [online]. 2004, vol.19, n.2, pp.61-75. ISSN 0254-0223.

Empirical models for non-destructive estimation of grapevine leaf area of the red variety Jaen are presented. Primary leaf area per shoot is estimated by a model using two variables: a calculated variable, obtained from the average of the largest and smallest primary leaf area multiplied by the number of primary leaves, and the area of the smallest primary leaf. For lateral leaf area per shoot another model using the same type of calculated variable plus the area of the largest lateral leaf is also presented. The good predicting capability show that the presented models can predict, using a non-destructive, simple and accurate method, primary and lateral grapevine leaf area per shoot in any growth stage. The simplicity, easiness and low cost of measuring the field variables needed make the models a powerful tool for vine researchers, consultants and even for advanced growers allowing a more frequent evaluation of vine leaf area.

Palavras-chave : grapevine; leaf area; empirical model; Jaen.

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