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Jack W. Buxton and John N. Walker

Natural-light growth chambers constructed within a greenhouse compartment were equipped with a ventilation/circulation system, two stages of heating, and evaporative cooling. Air drawn from the greenhouse compartment continuously ventilated the chambers; the air was heated or cooled to the set-point temperature. A computer-controlled environmental system maintained uniform temperatures within the chambers and maintained the temperature within ±1C of the set point at night and during periods of low solar radiation; during higher solar radiation periods, control was not as precise. Carbon dioxide concentration was accurately maintained, and the photosynthetic photon flux from supplemental high-pressure sodium lamps was ≈200 μmol·m-2·s-1. The natural-light growth chambers provide a means for studying the interactive effects of temperature, light, and other environmental variables in experiments to increase production efficiency.

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William A. Smith and Mark H. Brand

-treated seed in comparison with untreated seed. Six weeks post-treatment, all seedlings were transferred individually to 72-cell plug trays containing ProMix medium. Seedlings were grown on under greenhouse conditions with supplemental high intensity discharge

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James M. Garner and Allan M. Armitage

stems of P. paniculata forced under incandescent and high-intensity discharge lighting. Materials and Methods Expt. 1. On 1 Oct., rooted shoot tip cuttings of P. paniculata ‘Ice Cap’ were received at Athens, GA, in plug trays (72 per

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Cary A. Mitchell

multicolor arrays, the minimum distance between an LED array and the crop surface will be dictated by uniformity of color blending within the light beam rather than by tissue-scorching considerations, as it is for high-intensity discharge lighting. If the

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Sabrina J. Ruis, Humberto Blanco-Canqui, Ellen T. Paparozzi, and Russ Zeeck

rates for Expt. 1 and Expt. 2. Greenhouse temperatures averaged 27.7 °C during the day and 20.6 °C at night. Plants were illuminated with high-intensity discharge lighting for a 14-h photoperiod throughout both experiments. The corn stover rates

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Kang Mo Ku and John A. Juvik

14-h/10-h day/night temperature regime with supplemental high-intensity discharge lighting provided from 0600 to 2000 hr if light intensities fell below 2670 μ Einsteins/s/m 2 . Thirty days after germination, seedling trays were placed in ground