Abstract

This study aimed to evaluate the allelopathic effects of radish (Raphanus sativus L.) roots aqueous extracts on germination and some growth parameters of bread wheat (Triticum aesitivum L.), durum wheat (Triticum durum L.), wild oat (Avena fatua) and wild barley (Hordeum spontaneum). The concentrations were used in this study 0, 10, 20, 30, and 40%. The experiment was carried out in sterilized Petri dish during the 10 days incubated period at 22 °C and the experimental units were arranged in randomized complet design. In general, the results of the study indicated that the significant effects of concentrations level 10%, 20%, 30% and 40% of water extracts compared to control. The highest concentration (40%) of radish roots aqueous extract completely inhibited seed germination and growth of seedling while the lowest concentration (10%) had the least negative impact. The effects were concentration dependent on all studied parameters. Syringic acid, vanillic acid, and gallic acid profiled in radish root by using High-Performance Liquid Chromatography (HPLC). The aqueous radish extracts showed inhibitions effect on all studied plants, which 40% of its aqueous extracts significantly inhibited seed germination (100%) of the studied plant species. The results suggested that the radish root extracts can be recommended as a bioherbicide to inhibit weed germination.