The content of calcium (Ca), phosphorus (P), magnesium (Mg) and potassium (K) was analysed in 10 important species of grassland plants. The analyses of more than 500 samples give a better knowledge the influence of species, age and stage of development. The Ca content is clearly higher in the groups of legumes (15,1 ± 2,5 g/kg DM) and herbs (13,7 ± 4,0 g) than in the group of grasses (3,7 ± 1,1 g). The age and the stage of development have little effect. On average, the P concentration in grasses and legumes is similar (3,6 ± 0,8 g/kg DM and 3,4 ± 0,6 g), but it is higher in herbs (4,9 ± 0,9 g). The effect of age and stage of development is important, especially for grasses. The mean concentration of Mg is the highest in herbs (3,2 ± 1,0 g), followed by legumes (2,3 ± 0,5 g) and grasses (1,7 ± 0,5 g/kg DM). The growing cycle has an effect on the Mg content, whereas the age and the stage of development have only little influence. On average, the K content is almost the same for grasses and legumes (31,8 ± 6,4 g/kg DM and 31,1 ± 5,2 g), but higher for herbs (45,8 ± 6,8 g). It is mostly determined by the growing cycle, the age and the stage of development.
Herbicide-resistant weeds are a growing problem throughout the world. Monitoring herbicide resistance in Switzerland allows us to understand the mechanisms behind it and to better manage the use of herbicides.
Agroscope compared crop protection strategies in apple production. Reducing the use of plant-protection products lowered the local ecotoxological risks, but resulted in trade-offs between environmental and economic performance.
Bacillus thuringiensis (Bt) bacterium proteins protect Bt maize from being fed on by specific insects. A new, systematic analysis of international field data confirms that non-target organisms in Bt maize are largely spared.