Some Further Effects of Light and Temperature on the Growth of Young Tomato Plants

摘要

Previous work suggested that a relatively low level of supplementary artificial light could be used to offset the reduction in the growth rate of young tomato plants, normally resulting from a drop in air temperature of 2.2 deg C. The data obtained suggested that the compensatory level of illuminance with high-pressure sodium lamps was in the range 1.9 to 2.7 klx, but they were rather imprecise in this range. In this investigation a range of illuminances up to about 7 klx was used to provide further data. The work was done in a single experiment in the glasshouses at the Department of Agriculture and Horticulture, University of Reading, during the winter of 1976/77.