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Effects of radiation quality, intensity, and duration on photosynthesis and growthDifferences in radiation quality from the six most common electric lamps have little effect on photosynthetic rate. Radiation quality primarily alters growth because of changes in branching or internode elongation, which change radiation absorption. Growth and yield in wheat appear to be insensitive to radiation quality. Growth and yield in soybeans can be slightly increased under high pressure sodium (HPS) lamps compared to metal halide lamps, in spite of greatly reduced chlorophyll concentrations under HPS lamps. Daily integrated photosynthetic photon flux (mol m(exp -2)d(exp -1)) most directly determines leaf anatomy and growth. Photosynthetic photon flux (PPF) levels of 800 (mu)mol m(exp -2)s(exp -1) are adequate to simulate field daily-integrated PPF levels for both short and long day plants, but plant canopies can benefit from much higher PPF levels.
Document ID
19960011692
Document Type
Conference Paper
Authors
Bugbee, Bruce (Utah State Univ. Logan, UT, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1994
Publication Information
Publication: Wisconsin Univ., International Lighting in Controlled Environments Workshop
Subject Category
LIFE SCIENCES (GENERAL)
Funding Number(s)
CONTRACT_GRANT: NCC2-139
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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