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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.