Despite the oilseed production payment, linseed has remained a relatively unimportant oil plant in Switzerland. Nitrogen (N) fertilisation is a core component of linseed cultivation, since linseed is considered to be a fairly undemanding crop, yet one that is susceptible to lodging when over-fertilised with N. With the aim of studying the reaction of recently released varieties to different nitrogen levels, small-plot trials were conducted with the three summer linseed varieties Baladin, Princess and Récital. Above all, the results illustrate the importance of site factors for the variability of seed yield. Despite this, and based on the current organic-producer price as well as the Biorga fertiliser price, an economically efficient fertilisation optimum of 36 kg N/ha can be deduced. Since a negative correlation was also observed between N-fertilisation intensity and α-linolenic acid content, moderate N-fertilisation is likewise recommended for the production of high-quality linseed oil. However, significant differences between the fatty-acid profiles of the three linseed varieties studied show that the choice of variety is also an important element in the production of a high-quality oil.
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.