Bull. Spec. CORESTA Congress, Yokohama, 1996, p. 143, APOST5

Comparison effects of topping fertile and sterile low-nicotine tobacco grown on different soil materials

Institute of Field Crop Production, Lublin, Poland.
In a 3-year pot experiment, plants were grown on sandy, loamy and rendzina soils. Plants were topped at the beginning of flowering. The aim of the experiment was to determine how soil medium and topping are affecting physical and chemical properties of low-nicotine fertile and male sterile tobaccos. Growth and development of both forms of tobacco were the best on loamy material and slowest on poor, sandy one. On every soil material fertile plants characterized more intensive growth (terminal plants heights were higher by 7-11 cm), while sterile were slower in development (flowering delayed by 6-12 days). Topping promoted root growth (greater in fertile plants) resulting in increase of leaves area, thickness and weight (the latter on average by 11%). In both forms of tobacco there were positive effects of topping on chemical composition of leaves resulting in increase of carbohydrates and decrease of protein content. Neither topping, nor soil material affected nicotine content which was present in leaves only in trace amount.