Patchy weed distribution and site-specific weed control in winter cereals.

摘要

Site-specific weed control in winter cereals was performed on the same fields every year over a 5-year period (1999-2003). The most common weeds (Apera spica-venti, Galium aparine, Veronica hederifolia and Viola arvensis) were counted by species, at grid points which were georeferenced and the data were analysed spatially. For weed control, weeds were grouped into 3 classes: grass, broadleaved weeds (without Galium aparine), and Galium aparine. Based on weed distribution maps generated by spatial analyses, herbicide application maps were created and site-specific herbicide application was conducted for grouped and or single weed species. This resulted in a significant reduction in herbicide use. Averaging the results for all fields and years, the total field area treated with herbicides was 39% for grass weeds, 44% for broadleaved weeds (without Galium aparine) and 49% for Galium aparine. Therefore, site-specific weed control has the potential to reduce herbicide use compared to broadcast application, thus giving environmental and economic benefits..