Allelopathic Effects of Cool-season Turfgrass Mixture Clipping Extract on Four Weed Species and Detection of the Phenolic Compounds

In order to determine aqueous extract effects of coolseason turfgrass mixture clipping on germination and seedling growth of four weed species, laboratory and outdoor pot experiments were done at the experimental laboratory and greenhouse of the Doroud Parks and Landscape Organization, located in Doroud, Lorestan, Iran. The first factor was the concentration of sport turfgrass clipping extract (5, 10, 15, 20, 25% and 10, 25, 50, 75% (w/v) at laboratory and outdoor pot experiments, respectively) and the second factor was the type of weeds [dandelion (Taraxacum officinale), plantain (Plantago major), prostrate pigweed (Amaranthus blitoides) and common bermudagrass (Cynodon dactylon)]. A. blitoides was the most sensitive in both experiments. In both of the experiments, roots were more susceptible than shoots. For identifying phenolic acids, gas chromatography mass analysis displayed that this extract contained transcinnamic acid, 3,4,5trimethoxybenzoic acid, syringic acid, pcoumaric acid, caffeic acid, gentisic acid, protocatechuic acid and ferulic acid. The results demonstrated that sport turfgrass clipping extracts have an inhibitory property on germination and initial seedling growth of noxious weed species and could be potentially used as preemergence bioherbicide.