The Effect of an Incandescent Supplement on the Growth of Tomato Plants in Low Light

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Abstract
Young tomato plants were grown at low light flux densities (21 W m-2 for 8 h days) in growth cabinets under three types of fluorescent lamps or under a fluorescent/incandescent mixed source. Whilst net assimilation rates under the fluorescent lamps were in agreement with those calculated from the lamp characteristics and the photosynthetic action spectrum, the rate under the mixed source was about 20 per cent higher than expected. Relative growth rates and relative leaf area growth rates were also higher and leaf area ratios lower under the fluorescent/incandescent lamp combination than under the pure fluorescent sources. Small differences in stem elongation, leaf temperature and dry weight distribution which were associated with the addition of incandescent radiation were not considered to be responsible for these increases. When the light flux density from the mixed source was reduced by 20 per cent, the plant growth parameters were then similar to those in fluorescent light alone.

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