Romero, I., Benito, A., Dominguez, N., Garcia-Escudero, E. and Martin, I. 2014. Leaf blade and petiole nutritional diagnosis for Vitis vinifera L. cv. Tempranillo by deviation from optimum percentage method. Spanish Journal of Agricultural Research. 12, 1 (Jan. 2014), 206-214. DOI:https://doi.org/10.5424/sjar/2014121-4308.