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.
Grass-based beef production is markedly less productive than intensive year-round indoor-housing system-based production. Agroscope experts therefore studied how grass-based farms can produce both economically and in an ecologically sound manner.
Orchard crop spraying using unmanned aerial spraying systems commonly referred to as drones can lead to drift, posing a risk to residents and bystanders. The study shows that the risks arising from this are taken into account by the current registration process.
Trials conducted by FiBL have shown that conversion to organic farming also promotes endangered Red List species such as the carabid beetle species Amara tricuspidata. This species and other species consume seeds of forbs and grasses and thus supports natural weed control.