ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles
  • Other Sources  (2)
  • Man/System Technology and Life Support  (2)
  • 1985-1989  (2)
Collection
  • Articles
  • Other Sources  (2)
Source
Keywords
Years
Year
  • 1
    facet.materialart.
    Unknown
    Effect of 16 and 24 hours daily radiation (light) on lettuce growth (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A 50% increase in total radiation by extending the photoperiod from 16 to 24 hr doubled the weight of all cultivars of loose-leaf lettuce (Lactuca sativa L.) 'Grand Rapids Forcing', 'Waldmanns Green', 'Salad Bowl', and 'RubyConn', but not a Butterhead cultivar, 'Salina'. When total daily radiation (moles of photons) was the same, plants under continuous radiation weighed 30% to 50% more than plants under a 16 hr photoperiod. By using continuous radiation on loose-leaf lettuce, fewer lamp fixtures were required and yield was increased.
    Keywords: Man/System Technology and Life Support
    Type: HortScience : a publication of the American Society for Horticultural Science (ISSN 0018-5345); Volume 21; 1; 123-4
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Comparison of fluorescent and high-pressure sodium lamps on growth of leaf lettuce (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Radiation from high-pressure sodium (HPS) lamps provided more than a 50% increased yield (fresh and dry weight of tops) of loose-leaf lettuce cultivars Grand Rapids Forcing and RubyConn, compared to that obtained by radiation from cool-white fluorescent (CWF) lamps at equal photosynthetic photon flux; yet, input wattage was approximately 36% less. It was postulated that the considerable output of 700 to 850 nm radiation from the HPS lamp was a significant factor of the increased yield. Under HPS lamps, the leaves of both cultivars were slightly less green with very little red pigmentation ('RubyConn') and slightly elongated, compared to CWF, but plant productivity per unit electrical energy input was vastly superior with HPS.
    Keywords: Man/System Technology and Life Support
    Type: HortScience : a publication of the American Society for Horticultural Science (ISSN 0018-5345); Volume 22; 3; 424-5
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...