Allelopathic efficiency of orange fruit waste as a natural bioherbicid in controlling canarygrass and cheeseweed infested common bean plants.
This study was conducted to evaluate the bioherbicidal activity of orange peels against two selected weeds canarygrass and cheeseweed beside the response of common bean plants. Two successive pot experiments were applied with twelve treatments. The first four treatments were applied by incorporating of orange peels powder with the soil surface at successive rates (10, 20, 30 and 40 g/pot) one week pre-sowing of common bean. In the other corresponding four treatments the orange peels powder was incorporated with the soil surface at the same rates but directly at the same time with sowing of common bean seeds. Additionally, four unweeded control treatments were applied for comparison. The recorded results revealed the inhibitory allelopathic effect of orange peels powder on both weeds with direct relationship between the orange peels rate and it's inhibitory effect. However, the pre-sowing treatments were more effective than the others which applied at sowing. Orange peels at 40g/pot at one week pre-sowing gave the highest inhibitory effect on both weeds. This superior treatment subsequently recorded the highest growth parameters and yield traits of common bean. Estimated phenolic compounds, flavonoids and essential oils in orange peels may be responsible for this inhibitory effect.