Consequences of the use of different organic fertilizers (green manure, cereal straw, manure at 35 and 70 t ha-1 every 3 years and cattle slurry at 60 m3 ha-1 every 3 years) and mineral fertilizer (four doses nitrogen) are tested in Changins since 1976. This study analyses their long-term effect on organic, chemical and biological soil properties. After 34 years of trial, when crops receive optimal nitrogen fertilizer, the soil organic matter (SOM) content decreases 0,50 g/100 g of soil for the treatment «mineral fertilizer», 0,20 g/100 g for the treatments «greenmanure » and «straws» and 0,18 g/100 g for the treatments «manure 35 t ha-1 every 3 years» and «slurry 60 m3 ha-1 every 3 years». Only the treatment «manure 70 t ha-1 every 3 years» shows an increase in the SOM content of 0,15 g/100 g. Organic fertilizers do not significantly affect the main soil chemical properties, except for trace element contents. The treatments receiving manure and cattle slurry present higher amounts of copper, iron, zinc and manganese extractable in ammonium acetate EDTA than the control «mineral fertilizer». Organic fertilizers have also a positive significant effect on the activity and microbial biomass and seems to change the composition of this last.
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.