In the last ten years, Septoria tritici (ST) become one of the most important wheat diseases in Switzerland. To develop economic and intervention thresholds, 33 different situations from ten field trials with natural infections were analysed. Swiss wheat cultivars of different resistances were analysed from 1993 to 1997. For the economic threshold, a value of 10 % Septoria tritici- severity on leaf F-1 (F=flag) at dough development (GS 83-85) was found. From the economic threshold the intervention thresholds for the earlier growth stages 41-45 and 57-59 were derived. For both, a level of 15 % disease incidence (% of leaves with symptoms) on leaf F3 and F-2 respectively was obtained. Applying this threshold model, in 30 out of 33 cases an economically correct spray decision would have been taken.
A comparison of different methods of winter-wheat fertilisation with nitrogen showed that nitrogen surpluses can be significantly reduced by means of site-specific variable-rate nitrogen fertilisation.
Fabian Y., Roberti G., Jacot K., Gramlich A., Benz R., Szerencsits E., Churko G., Prasuhn V., Leifeld J., Zorn A., Walter T. (ꝉ), Herzog F.
Many tile drainage systems on arable land are in need of renewal. Cantons and stakeholders will now be given a decision-making tool enabling them to assess such areas in detail and to find sustainable solutions.
Ammonia emissions from the Swiss farming sector have scarcely declined over the past 20 years. This is because the factors leading to either an increase or decrease in emissions have for the most part cancelled each other out between 2000 and 2020.