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Author (down) Nelson, J.A.; Bugbee, B. url  doi
openurl 
  Title Economic analysis of greenhouse lighting: light emitting diodes vs. high intensity discharge fixtures Type Journal Article
  Year 2014 Publication PloS one Abbreviated Journal PLoS One  
  Volume 9 Issue 6 Pages e99010  
  Keywords Plants  
  Abstract Lighting technologies for plant growth are improving rapidly, providing numerous options for supplemental lighting in greenhouses. Here we report the photosynthetic (400-700 nm) photon efficiency and photon distribution pattern of two double-ended HPS fixtures, five mogul-base HPS fixtures, ten LED fixtures, three ceramic metal halide fixtures, and two fluorescent fixtures. The two most efficient LED and the two most efficient double-ended HPS fixtures had nearly identical efficiencies at 1.66 to 1.70 micromoles per joule. These four fixtures represent a dramatic improvement over the 1.02 micromoles per joule efficiency of the mogul-base HPS fixtures that are in common use. The best ceramic metal halide and fluorescent fixtures had efficiencies of 1.46 and 0.95 micromoles per joule, respectively. We also calculated the initial capital cost of fixtures per photon delivered and determined that LED fixtures cost five to ten times more than HPS fixtures. The five-year electric plus fixture cost per mole of photons is thus 2.3 times higher for LED fixtures, due to high capital costs. Compared to electric costs, our analysis indicates that the long-term maintenance costs are small for both technologies. If widely spaced benches are a necessary part of a production system, the unique ability of LED fixtures to efficiently focus photons on specific areas can be used to improve the photon capture by plant canopies. Our analysis demonstrates, however, that the cost per photon delivered is higher in these systems, regardless of fixture category. The lowest lighting system costs are realized when an efficient fixture is coupled with effective canopy photon capture.  
  Address Crop Physiology Laboratory, Department of Plant Soils and Climate, Utah State University, Logan, Utah, United States of America  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1932-6203 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:24905835; PMCID:PMC4048233 Approved no  
  Call Number GFZ @ kyba @ Serial 2233  
Permanent link to this record
 

 
Author (down) Myers, L.; Christian, K.; Kirchner, R. url  doi
openurl 
  Title Flowering responses of 48 lines of oilseed rape (Brassica spp.) to vernalization and daylength Type Journal Article
  Year 1982 Publication Australian Journal of Agricultural Research Abbreviated Journal Aust. J. Agric. Res.  
  Volume 33 Issue 6 Pages 927  
  Keywords Plants  
  Abstract Forty-eight lines of Brassica spp, of diverse origins were grown in the glasshouse either under natural daylengths or daylengths extended to 16 h by artificial illumination. Plants were either unvernalized or had been subjected to 6 weeks at 8¦C day and 6¦C night temperatures as seedlings. Lines could be classified into two major groups, according to whether or not vernalization or long photoperiods were essential for 50% flowering within 21 weeks. In six lines, both vernalization and long days were essential for prompt flowering, while only five lines did not respond to either treatment. Strong interactions between lines and treatments were found in the number of leaves and subtended buds at flowering. The results show that a wide range of responses is obtainable from material currently available, offering considerabk, scope for adaptation to different environments.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0004-9409 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number IDA @ intern @ Serial 2369  
Permanent link to this record
 

 
Author (down) Moore, B. url  doi
openurl 
  Title The Relative Length of Day and Night Type Journal Article
  Year 1920 Publication Ecology Abbreviated Journal  
  Volume 1 Issue 3 Pages 234-237  
  Keywords Plants  
  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0012-9658 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number GFZ @ kyba @ Serial 2407  
Permanent link to this record
 

 
Author (down) Matzke, E. B. url  openurl
  Title The Effect of Street Lights in Delaying Leaf-Fall in Certain Trees Type Journal Article
  Year 1936 Publication American Journal of Botany Abbreviated Journal Amer. J. of Botany  
  Volume 23 Issue 6 Pages 446-452  
  Keywords Plants; trees; Carolina poplar; Populus canadensis; London plane; Platanus acerifolia; sycamore; Platanus occidentalis; crack willow; Salix fragilis; New York; New York City  
  Abstract Street lights in the City of New York cause a retention of the leaves of certain trees: Carolina poplar (Populus canadensis), London plane (Platanus acerifolia), sycamore (Platanus occidentalis), and crack willow (Salix fragilis). Illuminated portions of a tree retain their leaves; shaded portions of the same tree do not. One side of a tree, or the lower part, may thus have numerous leaves, while the other side, and the upper part, may be entirely devoid of foliage. A relatively weak light, at a distance of as much as 45 feet from the tip of the nearest branch, may cause retention of numerous leaves. Light intensity as low as 1 foot candle, or less, may be effective. Some leaves may be retained at least a month, others more than that, beyond the normal season. The orientation of the light with respect to the tree – i.e., north, east, south, and west – is not significant. In Populus canadensis all of the leaves ultimately fall, abscission apparently taking place at the base of the petiole. In Platanus acerifolia and Platanus occidentalis some of the leaves are retained until killed by low temperature; then some of them break off above the base of the petiole. Leaves of the Populus and Platanus species discussed remain green unusually long when receiving additional illumination. Leaves of these same trees do not emerge from the buds earlier in the spring as a result of the additional illumination.  
  Address n/a  
  Corporate Author Thesis  
  Publisher JSTOR Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0002-9122 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number IDA @ john @ Serial 1394  
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Author (down) Matsuda, R.; Yamano, T.; Murakami, K.; Fujiwara, K. url  doi
openurl 
  Title Effects of spectral distribution and photosynthetic photon flux density for overnight LED light irradiation on tomato seedling growth and leaf injury Type Journal Article
  Year 2016 Publication Scientia Horticulturae Abbreviated Journal Scientia Horticulturae  
  Volume 198 Issue Pages 363-369  
  Keywords Plants  
  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0304-4238 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number LoNNe @ kyba @ Serial 1387  
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