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This article in AJ

  1. Vol. 50 No. 5, p. 283-284
    Received: Nov 18, 1957

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An Automatic Mechanism for Imposing Photoperiods in Greenhouse Research1

  1. B. L. Coffindaffer and
  2. O. J. Burger2



An automatically controlled canopy for regulating light and dark periods in greenhouse work was designed, installed, and operated successfully. This system effectively provided three photoperiods on the same bench covering a total area 5 by 30 feet in size.

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