Plant Protection Institute, BG-2230 Kostinbrod, Bulgaria
PENEVA, A., 2007. Allelopathic effect of seed extracts and powder of coffee (Coffea arabica L.) on common cocklebur (Xanthium strumarium L.). Bulg. J. Agric. Sci.,13: 205-211
Pot trials were conducted to determine the allelopathic effect of water extracts and dry powder of ripe coffee beans on germination and growth dynamic of Xanthium strumarium. It was established that both the extract concentrations and the doses of the incorporated coffee powder decreased in the X. strumarium germination. The number of the seedlings was smaller but they were better developed. That resulted in a stimulating allelopathic effect on the weed growth dynamic, especially in relation to the fresh weight. There only was a slight depressive effect of the higher dose incorporated coffee powder.