Thapsia garganica allelopathic potentialities explored for lettuce growth enhancement and associated weed control

Thapsia garganica phytotoxicity was studied on Lactuca sativa L. and associated weeds, by pulverization of its aqueous extracts (at 10, 20, and 30 %), in pot experiments. To comprehend its mode of action on lettuce, seedlings were grown hydroponically in Hoagland nutrient solution for two months, then the T. garganica leaves aqueous extract was added to the medium for three days. After the harvest, a number of physiological and biochemical...