The production of onions, worldwide and in Switzerland ranks at the forth position of all vegetable produced. In Europe cultivars are mainly available from breeders from France, Netherlands, Germany and Japan. Onions are of high nutrional value. The development of onion leaves is highly correlated to the sum of daily maxima Temperatures, independent of the site of production. In contrast the development of the onion, its yield potential and size depends on the cultivar, spacing and production system. Following quality regulations three main gradings of onions are distinguished: onions for sauces (22-35 mm Ø), sales at groceries (35-70 mm Ø) and for industry (>70 mm Ø). Onions, harvested in late summer, can easily be stored in barns up to six months. For the integrated production (IP) onions are mainly produced by direct sowing, where as for organic farming (BIO) mainly sets are used. As an alternative to sets, transplants are used as well. Results are shown from different trials comparing the different production systems
Stucky T., Hochstrasser M., Meyer S., Segessemann T., Ruthes A. C., Ahrens C. H., Dahlin P., Pelludat C.
The root knot nematode (RKN) Meloidogyne incognita causes damage in field and greenhouse crops. Agroscope researchers have developed a new screening test to identify bacteria that antagonise this agricultural pest.
With CULTAN fertilisation, nitrogen is injected into the soil as an ammonium solution. Multi-year trials conducted by Agroscope show that this method reduces nitrogen leaching by an average 38% without negatively affecting yields.
Tuta absoluta is one of the most destructive pests of solanaceous crops. Agroscope has developed a statistical model to study the population dynamics of the pest and its parasitoids and allows interventions to be optimally planned.