Effect of trunk cutting, root pruning, and double-trunk on the growth and yields of apple trees
Władysław Poniedziałek, Stanisław Porębski, Kazimierz Nosal, Bernadeta Rzeźnicka
Department of Pomology
Faculty of Horticulture, Agricultural University in Kraków
29 Listopada 54, 31-425 Kraków, Poland
In 2000-2002 the investigations were carried out on trees of ‘Melrose’ apple, grown on M.26
rootstock, planted in 1991. The trunk cutting with the chain saw, root pruning,
and double-trunk trees were compared. As an additional trunk a 10-cm long piece
of M.9 shoot was used. The treatments were performed in June 2000. All the
treatments decreased a cumulative increase (2001-2002) in the trunk
cross-section area. The length of limb leaders decreased only as a result of
trunk cutting. However, the canopy volume decreased in trees with a double
trunk and a bark grafting in inverted position on the main trunk. Cumulative
yields from two years after all treatments increased by 30-35%. The ratio of
the cumulative yield to a trunk cross-section increase (2001-2002) was several times higher than in the control, but it was significant only when the
double trunk with a 5-cm inverted ring of the bark on the main trunk was used.
The mean weight of fruit did not change. The colour of fruit was better when
the trunk cutting and double trunk with an inverted 5-cm bark ring on the main
trunk were used.
Poniedziałek W., Porębski S., Nosal K., Rzeźnicka B., 2004. Effect of trunk cutting, root pruning, and double-trunk
on the growth and yields of apple trees. Folia Horticulturae 16/2: 79-85.