The article describes the effectiveness of different treatment technologies used for slurry and how they affect methane emissions from the soil after the application of slurry. For the research, swine and cattle slurry was used, treated with the following technologies: addition of PRP or Effective Microorganisms, aeration, ozonation and methane fermentation. In addition, one of the samples was used without any modification as a control sample. The samples of treated slurry were applied to the soil from the Wielkopolska region. The composition of the emitted gases after the application of the slurry was tested in a gas chromatograph. The research allowed to identify aeration as the most effective method of slurry management, both for swine and cattle slurry. The swine slurry showed a higher potential for biogas production than cattle slurry. Moreover, when storing the digested slurry in closed chambers, and not applying it immediately after the fermentation process, improves the methane emission reduction. The effective microorganisms addition through the process of slurry treatment proved to be the least efficient process. Furthermore, the control sample allowed to compare the effectiveness of the abovementioned processes and their methane emission reductions.