Use of Beta vulgaris allelopathic properties to control some weeds associated with Lupinus albus plant comparing with two recommended herbicides.

Two pot experiments were carried out during two successive winter seasons of (2016 / 2017) and (2017 / 2018) at the green house of National Research Centre (NRC), Giza, Egypt. The experiments were conducted to compare the allelopathic effect of Beta vulgaris (shoot and root aqueous extracts at 3, 6, 9%) to chemical herbicides (clodinafop-Propargyl and Basagran at recommended dose (140 g/fed and 1.5 l/fed, respectively) in controlling weeds (Phalaris minor and Malva parviflora) associated with Lupinus albus plants. Results showed that all applied aqueous extracts caused reduction in two weeds biomass under investigation. Meanwhile, root aqueous extract was more effective than shoot aqueous extract in controlling weeds. It is worthy to mention that phenolic compounds and flavonoids in B. vulgaris root aqueous extract were higher than that in B. vulgaris shoot aqueous extract. In addition, all applied aqueous extracts increased growth, yield and yield components of L. albus plant. The inhibitory effect of B. vulgaris aqueous extract on weeds or its stimulatory effect on L. albus plants increased by increasing the extracts concentration. The two applied herbicides gave complete eradication of both weeds depending on selectivity of each herbicide followed by root aqueous extract of B. vulgaris at 9%; this in turn reflected on L. albus plants by scoring highest results as compared to unweeded treatment