OPTIMUM LEAF NITROGEN LEVELS IN TOBACCO SEEDLING

This paper establishes deficient and toxic levels of nitrogen (N) in t obacco seedlings of the Virginia type, suggesting that range of concen tration in the plant required in order to avoid possible nutritional p roblems before transplanting. The results show that the lamina tends t o contain more N than does the central midrib. The normal N content ra nge without visual N deficiency or toxicity symptoms in leaves at the young seedling stage should be 3.5-6.9% on a dry matter basis.