Articles
Growth control of ‘Oblačinska’ sour cherry (Prunus cerasus L.) grafted on Mahaleb (Prunus mahaleb L.) rootstock by using bioregulators
Article number
1449_17
Pages
127 – 134
Language
English
Abstract
Contemporary production of ‘Oblačinska’ sour cherry is encountered with an increasing lack of human workforce, primarily in harvest.
Harvest costs can be reduced by using combine harvester machine.
For mechanical harvest purposes, cherries are grafted on Mahaleb rootstock, which induces excessive vigor of trees and imposes the need for vigor control.
The experiment was setup in 2021 and 2022 in ‘Oblačinska’ sour cherry trees, grafted on Mahaleb rootstock and planted in 2019 at 4×2 m planting distance.
Romulan containing paclobutrazol (PB) was applied by soil drench once with the rates of 0.4, 0.7 and 1.3 L ha‑1 at the beginning of bud swelling.
Foliar bioregulator sprays were applied twice, at 3-5 leaves developed and two weeks later at the rates 1.0, 1.5 and 2.0 L ha‑1 of PB and 1.0, 1.25 and 1.5 kg ha‑1 Regalis® Plus containing prohexadione-Ca (Pro-Ca). PB applied by soil drench was the most effective in reducing shoots growth and the effect was persistent until the end of the growing season.
Shoots length was in average 6.4 cm in June and 6.0 cm in July 2021, while 3.7 cm in June and 3.2 cm in November 2022 in PB soil drench applied treatment.
ProCa was more effective than PB as a foliar spray in reducing shoots growth, with new growth emerged by the end of the season.
Fruits from trees treated with ProCa were larger and had the higher stem removing force than control ones.
Fruits from PB treated trees had the higher soluble solids content (SSC), acidity, stem removing force and fruit firmness, while lower L* color parameter.
Both PB and Pro-Ca can be used as efficient tool to control vigor of sour cherry grafted on Mahaleb rootstock, whereas the effects depend on the application method and chemicals rates.
Harvest costs can be reduced by using combine harvester machine.
For mechanical harvest purposes, cherries are grafted on Mahaleb rootstock, which induces excessive vigor of trees and imposes the need for vigor control.
The experiment was setup in 2021 and 2022 in ‘Oblačinska’ sour cherry trees, grafted on Mahaleb rootstock and planted in 2019 at 4×2 m planting distance.
Romulan containing paclobutrazol (PB) was applied by soil drench once with the rates of 0.4, 0.7 and 1.3 L ha‑1 at the beginning of bud swelling.
Foliar bioregulator sprays were applied twice, at 3-5 leaves developed and two weeks later at the rates 1.0, 1.5 and 2.0 L ha‑1 of PB and 1.0, 1.25 and 1.5 kg ha‑1 Regalis® Plus containing prohexadione-Ca (Pro-Ca). PB applied by soil drench was the most effective in reducing shoots growth and the effect was persistent until the end of the growing season.
Shoots length was in average 6.4 cm in June and 6.0 cm in July 2021, while 3.7 cm in June and 3.2 cm in November 2022 in PB soil drench applied treatment.
ProCa was more effective than PB as a foliar spray in reducing shoots growth, with new growth emerged by the end of the season.
Fruits from trees treated with ProCa were larger and had the higher stem removing force than control ones.
Fruits from PB treated trees had the higher soluble solids content (SSC), acidity, stem removing force and fruit firmness, while lower L* color parameter.
Both PB and Pro-Ca can be used as efficient tool to control vigor of sour cherry grafted on Mahaleb rootstock, whereas the effects depend on the application method and chemicals rates.
Publication
Authors
B. Milić, J. Goić, G. Barać, M. Milović, N. Magazin, J. Kalajdić, Z. Keserović
Keywords
vegetative growth, shoots, vigor, paclobutrazol, prohexadione calcium
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