Nutrient level comparisons of leaf petioles and blandes in eight wine grape varieties from anthesis until harvest
1994
Karagiannidis, N. (NAGREF, Thessaloniki (Greece). Institute of soil Science) | Mathaiou, A. (NAGREF, Makedonia-Thraki (Greece). Agricultural Research Centre) | Nikolaou, N. (Aristotelion Univ., Thessaloniki (Greece). Laboratory of vine growing)
Seasonal changes of leaf petiole and blade nutrient levels were compared in eight wine grape varieties over the 1991-1992 vegetative period. Sampling of the opposite to each bunch leaf was made at each of five successive growth stages. The results indicated that petiole Phosphorus, Potassium and Manganese levels were higher than blade levels. Blade Calcium and iron levels were generally higher than petiole levels. The concentrations of Calcium and Iron in the leaves have increased form anthesis to grape maturity and the concentration of Potassium decreased after the veraison stage. There was a highly significant correlation between petiole and blade levels of P, K, Mg, Ca, Fe and Zn.
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