ISHS Acta Horticulturae 383: Mineral Nutrition of Deciduous Fruit Plants
ROOTSTOCK EFFECT ON POTASSIUM CONTENT OF GRAPEVINE |
| Authors: | L. BRANCADORO, L. VALENTI, A. REINA |
| Keywords: | mineral nutrition, grapevines, rootstock, potassium |
| Abstract:
The effect of rootstock on potassium content of must and leaves in cultivar Croatina grafted onto 20 (plus own-rooted) different rootstocks was studied. Each rootstock significatively affected potassium content in leaves and in must. The highest levels were induced by the rootstock 44–53 M and SO4, the lowest by 140 Ru, 420 A and 1202C. The effect of the seasonal weather course ("year") on the level of must potassium was strictly linked to the rainfall amount during the vegetative period. The rootstock effect on must potassium levels was particularly marked in the driest year when, in general, potassium was lower. Potassium in musts and in leaves at veraison was strictly correlated to must pH. The results suggested that the choice of the appropriate rootstock genotype can improve grapevine nutrition in stress conditions (low potassium availability). In high potassium availability conditions, rootstock can control/modify K must levels only to some extent. | |
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