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Effects of paclobutrazol and rootstocks on macronutrient concentration in leaves of Melrose, Gloster, and Jonagold apple cultivars

Władysław Poniedziałek, Kazimierz Nosal, Stanisław Porębski, Jan Błaszczyk

Department of Pomology
Faculty of Horticulture, Agricultural University
29 Listopada 54, 31-425 Kraków, Poland

In the period 1988-1990 the concentration of macronutrients in the leaves of the apple cultivars Melrose, Gloster, and Jonagold was studied. Two experiments were established: in Experiment I apple trees grown on MM 106 and M 26 rootstocks were sprayed with different concentrations of paclobutrazol (PP 333), while in Experiment II the cultivars on rootstocks MM 106, M 26, and M 9 were compared.

The content of macronutrients in the leaves depended on the cultivar, rootstock, and paclobutrazol treatment. The leaves of Gloster trees had the highest concentration of all macronutrients except K. In Mg the difference was especially emphasized. The leaves of Jonagold trees had more K.

Paclobutrazol application reduced the level of P and Mg and increased that of Ca in leaves of Gloster apple trees. No similar effect on Jonagold or Melrose cultivars was found. In Experiment II the leaves of Gloster trees hhad more Ca and those of Melrose less Mg on rootstock MM 106 than on M 26. This was also true for Jonagold cultivar in Experiment I. The leaves of Gloster and Jonagold trees had less Mg on M 9 than on MM 106 rootstock, while the reverse was true for Melrose. The leaves of Gloster trees on M 9 had a smaller content of P and a greater one of K than the those of the same cultivar on other rootstock.

Poniedziałek W., Nosal K., Porębski S., Błaszczyk J., 1993. Effects of paclobutrazol and rootstocks on macronutrient concentration in leaves of Melrose, Gloster and Jonagold apple cultivars. Folia Horticulturae V/1: 99-108.