An experiment was conducted in order to evaluate the effect of 3 and 6 ton/ha vermicompost and 150 and 300 kg/ha nitrogen on seed germination of Datura stramonium L. at Shiraz University in 2012. Nutrition of maternal plants with six tons per hectare vermicompost caused the highest seed dormancy and lowest germination rate and seed vigor. In contrast, the highest germination rate and seed vigor was obtained in the maternal plant nutrition with 300 kg per hectare nitrogen. Place the seeds on maternal plants had a significant effect on seeds germination. So that the middle and lower seeds on the maternal plant had less germination rate and seedling vigor than those in upper part of the plant. Six tons vermicompost per hectare decreased the emergence percentage in seeds of this weed through increasing of dormancy in produced seeds.
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