Effect of Three Roots tocks on Grapevine (Vitis vinifera L.) CV. Négrette, Grown Hydroponically. I. Potassium, Calcium and Magnesium Nutrition

  • M. Garcia Ecole Nationale Superieure Agronomique de Toulouse, Centre de Viticulture et d'Oenologie de Midi Pyrenees, Avenue de l' Agrobiopole-Auzeville-Tolosane. B.P.107 F-31326 Castanet-Tolosan Cedex - France
  • P. Gallego Ecole Nationale Superieure Agronomique de Toulouse, Centre de Viticulture et d'Oenologie de Midi Pyrenees, Avenue de l' Agrobiopole-Auzeville-Tolosane. B.P.107 F-31326 Castanet-Tolosan Cedex - France
  • C. Daverède Ecole Nationale Superieure Agronomique de Toulouse, Centre de Viticulture et d'Oenologie de Midi Pyrenees, Avenue de l' Agrobiopole-Auzeville-Tolosane. B.P.107 F-31326 Castanet-Tolosan Cedex - France
  • H. Ibrahim Ecole Nationale Superieure Agronomique de Toulouse, Centre de Viticulture et d'Oenologie de Midi Pyrenees, Avenue de l' Agrobiopole-Auzeville-Tolosane. B.P.107 F-31326 Castanet-Tolosan Cedex - France
DOI: https://doi.org/10.21548/22-2-2202

Abstract

In order to study the lack of acidity in wines made out of cv. Negrette, a problem partially due to a high potassium content, this cultivar was grafted onto three different rootstocks, which were then grown in a nutrient solution.  Although cation nutrition varied as a function of the rootstock, the potassium level was high in leaves of all three rootstocks. Rootstock 3309 C induced the lowest potassium level. Furthermore, in combination with Negrette, SO 4 absorbed potassium more readily than 101-14 Mgt, contrary to the literature concerning other cultivars. To decrease the absorption of this element by Negrette, 3309 C appears to be the most appropriate rootstock.

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Vol. 22 No. 2 (2001)
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