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Shadehouses with photoselective nets featured in study of growing conditions
Date:11/19/2013

d Arthurs. The researchers then took light measurements monthly.

"We found that all shade nets reduced PAR compared with uncovered sites, but there were differences between colors," the scientists said. "Observed PAR values were reduced most under black nets and least under red nets with blue and pearl nets intermediate. Our results showed that photosynthetic shading values were black (55% to 60%), blue (51% to 57%), pearl (52% to 54%), and red (41% to 51%), depending on the season."

The research team examined the effects of the shade nets on other environmental variables as well. Average daily maximum air temperatures were higher inside shadehouses with colored nets compared with black nets or ambient. Highest air temperatures were recorded under red, while black nets were consistently cooler. Blue and pearl recorded similar temperatures, and were intermediate between red and black nets.

"Our study documents the different environmental modifications inside structures covered with black and colored nets, which will help predict or interpret specific plant responses," the authors said. "However, a review of the literature suggests that the responses of different plant species to modified light conditions are often variable."


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Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert

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