Articles
Photo-selective netting as a tool to regulate the floral phenology of hazelnut orchards under changing environments
Article number
1457_82
Pages
655 – 660
Language
English
Abstract
The use of photo-selective netting is a technique that has become widespread in fruit trees to mitigate the effects of climate change.
Still, there is limited information on its impact on hazelnut trees.
This study evaluated the use of pearl-gray (PG), blue-gray (BG), and black (B) photo-selective netting as a tool to regulate flowering phenology in ‘Tonda di Giffoni’ (TG) hazelnut orchard and its respective pollinator (P), leaving uncovered trees as a control (C). Male and female flower phenology progression was evaluated at BBCH stages 61-65 (fully elongated catkins) and 651-655 (glomerulus with fully elongated styles), respectively.
Accumulation of chilling hours (CH, 7°C base model), growing degree-days (GDD, 4.5°C base model), photosynthetically active photon flux (PPFD), and UV radiation were quantified.
The PG, BG, and B netting reduced PPFD in the same proportion (26%) compared to C, although the PG and BG netting slightly increased PPFD intensity (2%). The PG netting showed the lowest and highest values of CH and GDD accumulation, respectively.
In the TG cultivar, PG netting showed an advance of 27 and 28% in the development of male and female flowers, respectively, at stages BBCH 61-65 and 651-655. BG netting delayed the development of male and female flowers by 37 and 18%, respectively, compared to the PG net.
In the P cultivar, all nets advanced flower development compared to the control.
These results suggest that the use of photo-selective netting is a useful tool for anticipating or delaying flower development in hazelnuts.
The implications on pollination efficiency and fruit yield are discussed.
Still, there is limited information on its impact on hazelnut trees.
This study evaluated the use of pearl-gray (PG), blue-gray (BG), and black (B) photo-selective netting as a tool to regulate flowering phenology in ‘Tonda di Giffoni’ (TG) hazelnut orchard and its respective pollinator (P), leaving uncovered trees as a control (C). Male and female flower phenology progression was evaluated at BBCH stages 61-65 (fully elongated catkins) and 651-655 (glomerulus with fully elongated styles), respectively.
Accumulation of chilling hours (CH, 7°C base model), growing degree-days (GDD, 4.5°C base model), photosynthetically active photon flux (PPFD), and UV radiation were quantified.
The PG, BG, and B netting reduced PPFD in the same proportion (26%) compared to C, although the PG and BG netting slightly increased PPFD intensity (2%). The PG netting showed the lowest and highest values of CH and GDD accumulation, respectively.
In the TG cultivar, PG netting showed an advance of 27 and 28% in the development of male and female flowers, respectively, at stages BBCH 61-65 and 651-655. BG netting delayed the development of male and female flowers by 37 and 18%, respectively, compared to the PG net.
In the P cultivar, all nets advanced flower development compared to the control.
These results suggest that the use of photo-selective netting is a useful tool for anticipating or delaying flower development in hazelnuts.
The implications on pollination efficiency and fruit yield are discussed.
Publication
Authors
R.M. Bastías, I. Urra, C. Meza
Keywords
climate change, floral biology, protected fruit growing, Corylus avellana L
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