Assessment of the Allelopathic Effect of Sweet and Bitter Lupine Seed Powder on Controlling Canarygrass Associated Faba Bean

Abstract

The aim of this work is to study the allelopathic effects of incorporation of the seed powder of sweet and bitter lupine on the growth of canarygrass (Phalaris minor) associated faba bean (Vicia faba L.). For this purpose, the experiments were conducted in the greenhouse of the National Research Centre, Giza, Egypt in the two winter successive seasons, 2017/2018 and 2018/2019. The seed powder of sweet and bitter lupine was incorporated to the soil surface at rates of 5, 10, 15, 20 and 25g/kg soil. The results indicated reduction in canarygrass growth by both sweet and bitter lupine. Weed growth inhibition increased by increasing the concentration of the two seed powder. The highest rate of bitter or sweet lupine seed powder at 25g/kg soil gave the highest growth inhibition which controlled more than 80 and 60% of canarygrass. Weed growth suppression of canarygrass was associated with increasing in faba bean growth. The results also revealed increasing in number of pods/plant, weight of pods / plant, weight of seeds / plant and weight of 100 seeds that represented yield and yield components of faba bean. The results suggested that sweet and bitter lupine could be alternated chemical herbicides in controlling canarygrass.