Norwegian Journal of Agricultural Sciences : growth chambers with control of light quality

As a means of studying the effect of light quality on plant growth and development, growth chambers were made of double acrylic sheets which allowed the passage of coloured solutions. Four differently coloured solutions (blue, green, yellow and red), composed of different water soluble dyes, were used to fill the top and the walls of the chambers. The temperature was controlled by heating and cooling devices to within ± 0. 7 °C of the set point. At times of maximum solar radiation (800 W/m') the temperature rose 2-3 °C above the sel point. The interception of photosynthetic active radiation (PAR) was measured daily in all chambers. The chambers set-up proved very efficient for studying light quality in plant development