The project investigates the yield responses of plasma-treated manure, digestate and reject water, and ammonia solution in field experiments. In addition, the necessary equipment for injecting the ammonia solution during sowing will be built. In addition to field tests, the project includes demonstrations at practical farms. The plasma-treatment is especially aimed at increasing the soluble nitrogen concentration of manure and organic fertilizer products used in organic farming. In plasma-treatment, oxygen and nitrogen in the atmosphere are made to react with each other, resulting in nitrite and nitrate. In principle, the concentration of soluble nitrogen can be doubled. A 15% ammonia solution is produced during the nitrogen removal of the biogas plant's reject. It is currently mainly used for industrial purposes, but its potential as a fertilizer is being explored for situations where supply exceeds industrial demand.