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.
Spring J.-L-, Zufferey V., Verdenal T., Reynard J.-S., Lorenzini F., Bourdin G., Blouin A., Carlen C., Jermini M., Morisoli R., Ferretti M.
Five Merlot clones bred in Switzerland are currently being distributed by the certification sector. A multiyear trial conducted by Agroscope in Gudo (Canton of Ticino) has made it possible to compare them with French and Italian reference clones and to highlight their very good performances.
Arbuscular mycorrhizal fungi are important for healthy soils and crops. A pan-European study shows that plant-protection products adversely affect these fungi, reducing their ability to supply plants with phosphorus via their roots.
Birdsfoot trefoil and sainfoin are used in mixtures for perennial hay meadows and for tannin-containing fodder. Agroscope is adding two new cultivars of birdsfoot trefoil to the ‘List of Recommended Varieties of Forage Plants’, whilst there is no change in the case of sainfoin.