To study the effect of soil disturbance on seedling emergence and development of Chenopodiulm album a pot experiment was carried out outdoors during 2017. In spring 100 seeds/pot of C. album were sown at the soil surface with three soil disturbance treatments -no disturbance, disturbed down to 5 cm (0-5) and disturbed down to15 cm (0-15)- and with and without red bean (Phaseolus vulgaris L.). Four replicates were installed for each treatment. The bean seeds were sown at 5 cm depth. The number of emerged seedlings of C. album was recorded every 3 days. Three seedlings of C. album and bean that emerged simultaneously were chosen for recording the phenological development using BBCH scale. Result showed that the emergence of C. album was significantly affected by type of soil disturbance, but not by the presence of the crop. The number of emerged seedlings was higher at soil surface than in the soil disturbed treatments, and lower at 0-15 cm soil disturbed treatment. Phenological development of C. album was similar in all treatments until BBCH 11, after which the development of C. album became faster for plants grown without the crop. For C. album plants grown in competition with bean, phenological development was faster after BBCH 12 for plants that emerged from 0-15 cm than those from 0-5cm, and it was slower for plants emerged at the soil surface. It is concluded that both soil disturbance and crop competition affect the number of emergences and the phenological development of C. album, and this knowledge can be considered for the management of this weed species.
