Abstract
Blueberry (Vaccinium corymbosum 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 (PAR diffuse and PAR total , mol m -2 s -1 ), stomatal conductance (g s , mmol m -2 s -1 ) and maximum photochemical efficiency of photosystem II (F v /F m ) 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. PAR total decreased an average of 25% under tunnel, while levels of PAR diffuse increased more than 150%. The g s ranged between 42% and 99% higher in the high tunnel compared to the control, and was positive and statistically related (r 2 = 0.69**) to PAR diffuse 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.
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Claims 8
Claim · model-written summary
Maximum temperature inside high tunnels averaged 10-12 C higher than the control.
Verbatim
e0“The maximum T was on average 10-12 C higher inside the high tunnel than the control”
t0“blueberry”
Claim · model-written summary
Minimum temperature inside high tunnels averaged 2-5 C higher than the control.
Verbatim
e0“the minimum T averaged only 2-5 C higher”
t0“blueberry”
e1“inside the high tunnel than the control”
Claim · model-written summary
Total PAR decreased by an average of 25% under the tunnel.
Not reportedComparator
Verbatim
e0“PAR total decreased an average of 25% under tunnel”
t0“blueberry”
Claim · model-written summary
Diffuse PAR increased by more than 150% under the tunnel.
Not reportedComparator
Verbatim
e0“levels of PAR diffuse increased more than 150%”
t0“blueberry”
e1“25% under tunnel, while levels of PAR diffuse increased more than 150%”
Claim · model-written summary
Leaf stomatal conductance was 42% to 99% higher in high tunnels than in controls.
Verbatim
e0“The g s ranged between 42% and 99% higher in the high tunnel compared to the control”
t0“blueberry”
Claim · model-written summary
Stomatal conductance was positively related to diffuse PAR variation.
Not reportedSetting
Verbatim
e0“was positive and statistically related (r 2 = 0.69**) to PAR diffuse variations”
e1“The g s ranged between 42% and 99% higher”
t0“blueberry”
Claim · model-written summary
Accumulated blueberry yield was 44% higher under high tunnels.
Verbatim
e0“Blueberries under high tunnel recorded an accumulated yield 44% higher”
e1“compared to control”
t0“blueberry”
Claim · model-written summary
Harvest began 14 d earlier under high tunnels than in controls.
Verbatim
e0“harvest started 14 d earlier compared to control”
e1“Blueberries under high tunnel recorded an accumulated yield 44% higher, while harvest started 14 d earlier compared to control”
t0“blueberry”
The same questions in other papers
protected cultivation · yield · VacciniumResults agree
1 paper in the same direction as this paper
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