The Réglette azote colza® is a decision support tool for rapeseed nitrogen fertilization, developed by the French institute Terres Inovia. This tool was designed to determine the nitrogen dose the most adapted to the needs of the crop, based on the rapeseed status at the beginning and at the end of the winter. The parameters were evaluated from field experiments carried out by Agroscope. The tool was then tested on technical, economic and environmental criteria and compared to the corrected norms. On our dataset, the Réglette azote colza® gave better estimation of the crop’s nitrogen needs than the corrected norms. The improvement of the estimation results in a reduction of the number of situation with nitrogen excess or deficiency, and therefore, an optimization of nitrogen use. This study, with first positive results, needs further assessment in various environments, to represent the diversity of the conditions of rapeseed production in Switzerland.
Herbicide-resistant weeds are a growing problem throughout the world. Monitoring herbicide resistance in Switzerland allows us to understand the mechanisms behind it and to better manage the use of herbicides.
Agroscope compared crop protection strategies in apple production. Reducing the use of plant-protection products lowered the local ecotoxological risks, but resulted in trade-offs between environmental and economic performance.
Bacillus thuringiensis (Bt) bacterium proteins protect Bt maize from being fed on by specific insects. A new, systematic analysis of international field data confirms that non-target organisms in Bt maize are largely spared.