Bull. Spec. CORESTA Symposium, Kallithea, 1990, p. 158, P01, ISSN.0525-6240

The use of soil solarization in tobacco seedbeds compared to conventional disinfestation

Tobacco Institute, Drama, Greece
In 1987-88 and 1988-89, at the Tobacco Institute of Greece (Drama), experiments were conducted in tobacco seedbeds, in order to evaluate the effect of soil solarization on the incidence of damping-off, on the seedlings' growth, on the number of transplants and, finally, on the number of the weeds present, in comparison to chemical desinfestation and to control plots. The use of transparent polyethylene sheets (0.02 mm thick) to cover the plots of"soil solarization" treatments controlled very well the seedbed damping-off, favored very much the growth of the seedlings, gave a very high number of transplants and restricted somehow the number of weeds present. The use of black polyethylene sheets (0.08 mm thick) gave pretty good results. The use of Methyl bromide, at a rate of 60 g/m2, before sowing, as it is done traditionally, gave excellent results, that is, a negligible attack of damping-off, excellent seedlings' growth, a very low number of weeds and the maximum number of transplants. The same chemical, when it was used in preceding October, gave very goods results. Methan-Sodium 32.7% (Vapam), at a rate of 150 cc/m2, when used before sowing, gave very good to excellent results. The same chemical, used in preceding October, gave very good results. Calcium cyanamide, at a rate of 150 g/m2, used in the seedbed, showed no effectiveness.