Seeds of datura plants ( Datura stramonium L.) were collected from three different locations (Kurupelit, Vadiler Sitesi and Gelemen) and examined at different nitrogen levels (0, 50, 100, 150 and 200 kg N/ha) for two years (1993 and 1994) in the Kurupelit Campus area of O.M.U., Samsun, Black Sea coastal area. The field experiments were conducted in a split-plot randomized block design with three replications. The highest fresh and medicinal herb yields were obtained by application of 150 kg of nitrogen per hectare, and seed yield was increased by increased nitrogen application levels. Therefore, it may be necessary to test higher nitrogen levels for maximum yield.

Seeds of datura plants ( Datura stramonium L.) were collected from three different locations (Kurupelit, Vadiler Sitesi and Gelemen) and examined at different nitrogen levels (0, 50, 100, 150 and 200 kg N/ha) for two years (1993 and 1994) in the Kurupelit Campus area of O.M.U., Samsun, Black Sea coastal area. The field experiments were conducted in a split-plot randomized block design with three replications. The highest fresh and medicinal herb yields were obtained by application of 150 kg of nitrogen per hectare, and seed yield was increased by increased nitrogen application levels. Therefore, it may be necessary to test higher nitrogen levels for maximum yield.