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Felipe Salazar-Canales,Richard M. Bastías,Arturo Calderón-Orellana,Rosemarie Wilckens,Esteban González 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.6
Photo-selective colored nets have been used as a tool to reduce climatic stress and improve yields in horticultural crops, butthere is no knowledge regarding responses of hazelnut crops under these nets. The objective of this research was to study theinfl uence of photo-selective nets on the microclimate, physiological characteristics of leaves, and yield in hazelnut. Duringthree consecutive seasons, a hazelnut orchard ´Tonda di Giff oni´ was covered with black, blue-gray, and pearl-gray colorednets with a standard density of 4 warp and weft threads cm −1 . Uncovered trees were used as the control. Microclimaticconditions (solar radiation intensity and composition, air temperature, relative humidity, and vapor pressure defi cit, VPD),yield components (accumulated yield; yield by harvest date; fruit weight, FW; and seed weight, SW), and leaf physiologicalcharacteristics (net photosynthesis rate, A n ; stomatal conductance, g s ; specifi c leaf weight, SLW; and stomatal density, SD)were evaluated. Pearl-gray netting had the greatest increase in diff use (47%) and global (5%) solar radiation compared toblue-gray and black nettings. VPD decreased by 12% under black netting, but only by 5% under pearl-gray and blue-graynetting. Pearl-gray nets signifi cantly increased accumulated yield, FW, and SW by 12, 13, and 6% compared to the control,respectively. Black and blue-gray nets reduced SD by 8 and 30% and SLW by 15 and 20%, respectively. Pearl-gray nettingdid not alter either SD or SLW. A signifi cant relationship between A n and g s was found under all nets, but not for the control. The relationship between A n and g s was signifi cantly positive for pearl-gray netting and negative for blue-gray netting. Photo-selective netting is a physiology-based tool that improves yield in hazelnut orchards under extreme climate conditions. Pearl-gray netting is the most promising alternative for this fruit crop.