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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 75, No. 3, 2015, pp. 291-297
Bioline Code: cj15039
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 75, No. 3, 2015, pp. 291-297

 en Influence of microclimatic conditions under high tunnels on the physiological and productive responses in blueberry ‘O’Neal’
Retamal-Salgado, Jorge; Bastías, Richard M.; Wilckens, Rosemarie & Paulino, Leandro

Abstract

Blueberry ( Vaccinium corymbosum check for this species in other resources L.) production under tunnels has spread in recent years. However, there is little information on the productive and physiological responses of blueberry grown under high tunnels. The objective of this research was to evaluate the effect of high tunnel microclimate on the physiological and productive responses of blueberries. A total of 1296 plants of highbush blueberry ‘O’Neal’ were grown in high tunnels, leaving the same amount of plants under open fields (control). Environmental temperature (T, °C) and relative humidity (RH, %), diffuse and total photosynthetically active radiation (PARdiffuse and PARtotal, μmol m-2 s-1), stomatal conductance (gs, mmol m-2 s-1) and maximum photochemical efficiency of photosystem II (Fv/Fm) of the leaf were measured. Fruit yield, date of harvest initiation and fruit growth rate were also determined. The maximum T was on average 10-12 °C higher inside the high tunnel than the control, whereas the minimum T averaged only 2-5 °C higher. PARtotal decreased an average of 25% under tunnel, while levels of PARdiffuse increased more than 150%. The gs ranged between 42% and 99% higher in the high tunnel compared to the control, and was positive and statistically related (r2 = 0.69**) to PARdiffuse variations. Blueberries under high tunnel recorded an accumulated yield 44% higher, while harvest started 14 d earlier compared to control. The results suggest that high tunnels in blueberries increases fruit yield and improves precocity due to higher temperatures during the flowering stage and fruit set. Particular light conditions under tunnels would favor higher leaf stomatal conductance in this crop.

Keywords
Light conditions; productivity; protected crops; temperature; Vaccinium corymbosum

 
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