EFFECTS OF CARBON ARC LIGHT ON THE CHEMICAL COMPOSITION AND VEGETATIVE PROPAGATION OF TOMATO PLANTS GROWN WITH A LIMITED SUPPLY OF NITROGEN

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Abstract
The carbohydrate content of plants increased very rapidly over a period of 10 days, during which time the plants were grown with N-free nutrient under artificially controlled environmental conditions and illuminated for 12 hrs. daily with light from a C arc lamp. There was an increase in the production and growth of roots by cuttings made from tomato plants grown in natural light of low intensity, and then exposed to arc light for a period of 80 hrs. prior to making the cuttings. Cuttings from such irradiated plants were less subject to decaj* than those taken from plants grown in natural light of low intensity during winter.