Task 2 of Multi4More aims to investigate the nutrient replacement value and optimal functional group proportions of grass, legume, and herb in multispecies mixtures across three field sites (Teagasc, Johnstown Castle; UCD Lyons; AFBI Crossnacreevy). In a plot experiment, we have sown different combinations of grasses, legumes and herbs (using a simplex design) at three nitrogen levels (0, 75, 150 kg N per ha per yr). We also include comparisons with a perennial ryegrass monoculture, and grass-clover mixtures.
This field experiment will measure dry-matter yield, nitrogen replacement value, and the nutrient use efficiency of mixtures under varying proportions of grass, legume, and herb, and different levels of nitrogen fertiliser.
Preliminary results from the first year of the experiment (2024) are available on p. 62 of the conference proceedings of the European Grassland Federation (2025).
