Search results for "FIELD BORDER"
showing 2 items of 2 documents
Variation of post-dispersal weed seed predation according to weed species, space and time
2008
International audience; Post-dispersal seed predation is an important source of mortality in plant populations. If this phenomenon is better known in tropical and woody systems, information is lacking for weeds in French agrosystems. In this paper, we evaluated seed predation variability in an organic wheat field by conducting experiments on weed seed preference and on spatial and temporal variation in predation rates. Weed seed predation preferences followed a species rank: Viola arvensis = Stellaria media > Alopecurus myosuroides = Chenopodium album > Sinapis arvensis = Anagallis arvensis = Galium aparine > > Plastic globules (for control), with weekly mean predation rates between 19 and …
Conséquences de l’utilisation de variétés de tournesol tolérantes aux herbicides sur la flore des agrosystèmes
2022
The farming practices associated with the use of sunflower herbicide-tolerant varieties (HTVs) have raised concerns among public authorities, who have recommended monitoring the potential effects of HTVs on biodiversity. In this context, at the scale of three French departments, the vegetation of 239 sunflower fields and their margins was studied between 2017 and 2019. This lower weed diversity can be attributed to shorter crop rotations and higher herbicide use. Admittedly, the higher densities of A. artemisiifolia observed in plots with HTVs are the cause of the use of these varieties rather than the consequence of these practices. However, these practices do not seem to solve the problem…