|Semb torresen, Kirsten|
Submitted to: European Weed Research Society Symposium Proceedings
Publication Type: Abstract only
Publication Acceptance Date: 12/13/2006
Publication Date: 1/18/2007
Citation: Rasmussen, I.A., Benoit, D.L., Davis, A.S., Forcella, F., Gonzalez-Andujar, J.L., Graziani, F., Grundy, A., Karlsson, L., Mead, A., Milberg, P., Murdoch, A., Neve, P., Salonen, J., Sera, B., Sousa, E., Tei, F., Semb Torresen, K., Urbano, J.M. 2007. Effects of interactions between germination environment, seed provenance and soil disturbance on emergence of Chenopodium album [abstract]. European Weed Research Society Symposium Proceedings. 14:9. Interpretive Summary:
Technical Abstract: A multi-locational experiment commenced in autumn 2005 to test the hypotehesis that the magnitude and distribution of emergence of Chenopodium album differs with timing of superficial disturbance of the soil around the normal time of emergence in undisturbed soil. In the field, such a disturbance event could be preparation of seedbed, false seedbed or mechinical weed control. Added knowledge about the effects of such distrubance events on any modification of emergence patterns or depletion of the seedbank will be beneficial. Disturbance may influence weed emergence, for example, by exposing seeds to light or increasing oxygen in the soil hence facilitating germination, reducing soil moisture, hampering germination/emergence, or by killing or burying seeds that have already started to germinate. A common seedlot of C. album from the Danish participating site was used at all 12 locations throughout Europe and North America. A local seedlot of C. album was also included at each site with the same treatments applied. The experiment aimed to assess the variability of the common seedlot (Danish) between locations, and differences between the common seedlot and the local seedlot within a location. Initial results showed significant differences in emergence patterns between common and local seedlots and there were also different responses between locations. Noticeable time lags between disturbance events and emergence flushes were not consistent between sites and are most likely explained by environmental variability at the point of disturbance. This warrants further analysis and exploration.