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Aims: The effect of aqueous extracts of castor bean (Ricinus communis L.) On the germination of six cultivated crops was investigated. Study Design: Samples of R. communis were harvested from the region of Gabs (south of Tunisia) and tested at laboratory on crops seeds. Place and Duration of Study: Regional station of Gabs-National Institute of Research in Rural Engineering, Waters and Forests -Tunisia, between October and December 2014. Methodology: Extracts were obtained after an incubation of 9 g of dry plant material (powder) in 100 ml distilled water during 48 hours at 60C. The extraction was made from five parts of R. communis (root, twig, leaf, seed and pericarp) and used in germination tests. Results and Conclusion: Results showed two types of behavior: the aqueous extracts of root,
Saadaoui et al. (Sat,) studied this question.