A farmer in Plomodiern is conducting a trial to test the effectiveness of intersowing different plant species between cereals to reduce nitrogen residues and produce fodder for cows. The trial, which involves various sowing methods and crop species such as mustard and nyger, has initial success with 61 kg of nitrogen residues measured per hectare. The results will be monitored to assess the ability of the cover crops to supply nutrients to the next cereal crop.