No-till and conventional plough tillage have been compared since 1994 in the Oberacker longterm field experiment at Inforama Ruetti in Zollikofen (Switzerland) on a slightly humic sandy loam soil. Crops were grown in a six-year crop rotation in a strip trial with six adjoining plots. Nineteen years into the trial, undisturbed cylindrical samples were taken at 10 cm and 40 cm depth from both cropping systems. The sampling was supplemented with reference samples from the permanent-grassland strips between the experimental plots. The samples were used to determine air-filled porosity (εa), relative gas diffusivity (Dp/D0) and air permeability (ka) at five different matrix potentials between –30 and –500 hPa. For no-till and the permanent-grassland strips, pore-system and gas-transport characteristics were similar in both the topsoil and subsoil, although less favourable in the topsoil. By contrast, conventionally tilled soils exhibited a clear stratification: εa, Dp/D0 and ka were more favourable in the topsoil and less favourable in the subsoil than for no-till and the permanent grassland strips, respectively. With no-till, the biopore-rich subsoils tended to lead to higher yields than under conventional tillage. In an evaluation of impacts of cropping systems on soil quality, the entire soil profile (i.e. topsoil and subsoil) should be studied, and key soil functions such as productivity should be included in the assessment.
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.