Abstract:
Laboratory and greenhouse experiments were carried out at the Faculty of Agricultural Sciences, University of Gezira, Sudan in season 2014/15 to study the allelopathic effects of Jimsonweed (Datua stramonium L.) seed on seed germination and seedling growth of some poaceous crops. Laboratory experiments were conducted to study the allelopathic effects of aqueous extract of Jimsonweed (Datua stramonium L.) seed on seed germination of sorghum (Sorghum bicolor [L.] Moench), millet (Pennisetum glaucum [L.] R. Br.), maize (Zea mays L.) and wheat (Triticum vulgare L.). Six concentrations (0, 20, 40, 60, 80 and 100%) of the aqueous extract of Jimsonweed seed were prepared from the stock solution (50 g / l). Treatments, for each crop, were arranged in completely randomized design with four replicates. The seeds were examined for germination at three days after initial germination. Greenhouse experiments were conducted to study the allelopathic effects of Jimsonweed seed powder on seedling growth of the same poaceous crops. The seed powder was incorporated into the soil at rate of 0, 1, 2, 3, 4 and 5% on w/w bases in pots. Treatments, for each crop, were arranged in completely randomized design with four replicates. The experiments were terminated at 30 days after sowing and the plant height, number of leaves and root length of crop seedlings were measured as well as plant fresh and dry weight. Data were subjected to analysis of variance procedure. Means were separated for significance using Duncan`s Multiple Range Test at p 0.5. The results showed that the aqueous extract significantly reduced seed germination of the tested poaceous crops and there was direct negative relationship between concentration seed germination. Also, the results showed that incorporating seed powder into the soil significantly decreased plant height, number of leaves and root length of crop seedlings as well as seedling fresh and dry weight. In addition, the reduction in seedling growth was increased as seed powder increased in the soil. It concludes that Jimsonweed has allelopathic effects on seed germination and seedling growth of the poaceous crops.
