ISHS Acta Horticulturae 448: III International Symposium on Mineral Nutrition of Deciduous Fruit Trees
INFLUENCE OF VINE IRRIGATION (V. VINIFERA L.) ON POTASSIUM NUTRITION |
| Authors: | O. Zaballa, E. García-Escudero, J.B. Chavarri, H. Medrano, M.C. Arroyo |
| Keywords: | irrigation, nutrition, potassium, Tempranillo |
| Abstract:
During 1994, and throughout an irrigation experiment in progress since 1990 in Rioja Baja (Spain), dry matter in watered and non watered vines, and potassium exports from leaves, shoots, and clusters were measured. Potassium concentration from bloom until one month after harvest, of petiole and blades were measured five different times with an interval of four-five weeks. At the same time the potassium quantity in must and wine was also measured. Irrigation increased dry matter by 53% and potassium exports by 65%, the largest proportion of which was in the grape cluster. However, the percent potassium relative to the renewable components remained constant. Potassium concentration in leaves gradually decreases throughout the test period with differences between watered and non-watered vines commencing during veraison and being maintained until the last observation. However similar differences in must potassium concentration (veraison and harvest) were not found, although the wine levels from watered plots were slightly higher. | |
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