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Abstract Detail


Recent Topics Posters

Schaubach, Rebecca [1], Tyra, Josh [1], Elam, Joseph [1], Anderson, Neil [1].

A comparison of plant growth of Lolium and Capsicum with LED, HID/HPS, and natural lighting.

Light emitting diodes (LEDs) are efficient, low energy cost, and low heat generating lighting, which have recently been developed for greenhouse production. LEDs (blue, red light; using a new prototype) were tested with Lolium perenne and Capsicum annuum for their effects on plant growth in comparison with equivalent light intensity (52 µmol m-2 s-1) of high intensity discharge/high pressure sodium (HID/HPS) lamps, and natural lighting at 18/18C day/night temperatures (0 DIF). Each light experiment was surrounded by black cloth to prevent light pollution. Plant growth was measured by weekly recording of seed germination (%, timing), plant height, number of nodes, number of tillers, leaf number, flowering (initiation, flowering), root:shoot ratio, and fresh weights. Seed germination was higher with LED (67%) than HID/HPS (46%) for Capsicum. Likewise, flower bud initiation was 1 wk earlier under LEDs than HID/HPS and natural lighting. Fresh weights were significantly different between all treatments; all other measurements had a similar trend. This is the first report of significantly greater growth of plant species under LEDs than other lighting sources in greenhouses, indicating their potential use for classroom educational laboratories and sustainable greenhouse production.


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1 - University of Minnesota, 1970 Folwell Avenue, St. Paul, MN, 55108, USA

Keywords:
lighting
Plant Growth
light emitting diode
red light
blue light.

Presentation Type: Recent Topics Poster
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P79030
Abstract ID:2698


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