The percentage recovery of fertilizer nitrogen (cattle slurry and ammonium nitrate) in the harvested herbage of grass-clover mixtures, cocksfoot (Dactylis glomerata L.), perennial rye-grass (Lolium perenne L.)and white clover (Trifolium repens L.) were investigated. The mean amount of N in the yield of grass-clover mixtures (five cuts per year), which were fertilized with 150 kg slurry N ha-1 and year-1 , was 318 kg N ha-1 and year-1. Depending on the proportion of clover, 41 to 55 % (average: 47 %) of this harvested amount of N was derived from biological nitrogen fixation. The amount of N supplied by the soil and the atmosphere represented 33 % of the yielded N. The uptake of the slurry N contributed to 20 % of the total N, which corresponded to an apparent recovery of the slurry N of 41 %. The apparent recovery of the mineral fertilizer N was similar to the recovery of the slurry N. In grass monocultures the recovery of slurry N was slightly lower and of mineral fertilizer N higher than in grass-clover mixtures.
Agroscope has developed a scoring system for plant protection in vegetable crops. The system enables the creation of incentives for reducing the use and environmental risks of plant-protection products and promoting preventive and non-chemical measures.
Many consumer goods contain activated carbon, which can be contaminated with pollutants like polycyclic aromatic hydrocarbons (PAHs). Agroscope showed that current analytical methods and legal bases used to address PAH content are incomplete.
Dry summers can see a loss of up to 25% of total Swiss roughage production. This is because grassland yields are strongly correlated with summer drought, as shown by a new analysis conducted by Agroscope and the Swiss Farmers’ Union.