Articles
Effect of prohexadione-Ca and paclobutrazol on the vegetative and reproductive characteristics of hazelnut cultivar ‘Tonda di Giffoni’
Article number
1457_49
Pages
389 – 396
Language
English
Abstract
Since hazelnut trees show strong growth at a young age, this study investigated the effect of plant growth regulators (PGRs) on growth suppression and reproductive traits in the first years of yield of hazelnut trees of the cultivar ‛Tonda di Giffoni’. In 2022, the effects of the two growth inhibitors prohexadione-calcium (P-Ca) and paclobutrazol (PB) on five-year-old hazelnut trees were investigated.
The treatments consisted of an untreated control, two foliar applications of P-Ca, and one foliar application of PB. The treatments were applied twice for P-Ca (125 mg L‑1) and once for PB (250 mg L‑1). The study investigated the influence of P-Ca and PB on the extent and dynamics of young shoot growth, vigor, wood mass removed during winter pruning, time required for pruning, yield, and morphometric characteristics of the nut.
Both regulators affected the dynamics of young shoot growth, but only P-Ca had a significant effect on the reduction of shoot growth, with the average shoot length in PB and the control trees being 37.6 cm and 37.3 cm, respectively, while in P-Ca it was 27.1 cm.
Both PGRs had some effect on nut morphometric characteristics, such as nut and kernel height, kernel width and thickness, kernel roundness index, nut and kernel volume, and shell thickness.
Although there was a significant difference in the mass of wood removed, the time required for winter pruning was not affected by the PGR treatments.
There were no significant differences among treatments in kernel percentage or yield.
The treatments consisted of an untreated control, two foliar applications of P-Ca, and one foliar application of PB. The treatments were applied twice for P-Ca (125 mg L‑1) and once for PB (250 mg L‑1). The study investigated the influence of P-Ca and PB on the extent and dynamics of young shoot growth, vigor, wood mass removed during winter pruning, time required for pruning, yield, and morphometric characteristics of the nut.
Both regulators affected the dynamics of young shoot growth, but only P-Ca had a significant effect on the reduction of shoot growth, with the average shoot length in PB and the control trees being 37.6 cm and 37.3 cm, respectively, while in P-Ca it was 27.1 cm.
Both PGRs had some effect on nut morphometric characteristics, such as nut and kernel height, kernel width and thickness, kernel roundness index, nut and kernel volume, and shell thickness.
Although there was a significant difference in the mass of wood removed, the time required for winter pruning was not affected by the PGR treatments.
There were no significant differences among treatments in kernel percentage or yield.
Publication
Authors
N. Teić, B. Đorđević, D. Radivojević, Č. Oparnica, D. Milatović, Đ. Bokov, M. Stojanoski
Keywords
plant growth regulators, shoot growth, yield, nut and kernel characteristics
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