2013. Allelopathic effects of aqueous extracts of leaves of tree marigold (Tithonia diversifolia (Hemsl.) A. Gray) on seed germination and seedling growth of lettuce (Lactuca sativa L.). Scientia Agropecuaria. 4, 3 (Oct. 2013), 229–241. DOI:https://doi.org/10.17268/sci.agropecu.2013.03.09.