Use of machines for liquid manure aerating and mixing

Abstract The paper concerns the ecological aspects of liquid manure. In order to have a better insight into the efficiency of the machine, four samples of liquid manure were analysed, namely two samples from a pit without aerators and two samples from a pit with incorporated aerator. The analysis showed that the dry matter content in the liquid manure amounted to 5.05–5.74%. The sample taken from the pit with incorporated aerator after 20 min of mixing contained the greatest quantity of the dry matter. The nitrogen and phosphorus contents were equal to the average; again the sample taken out of the pit with aerator stood out. The values of potassium exceeded the European average. The aerated liquid manure was spread on the surface more uniformly; it flowed off the plants and penetrated faster into the ground up to the roots. When the aerated liquid manure was sprinkled, the bad smell in the environment was considerately lower. Pumping into the cistern was much easier because it did not contain clods. The fodder remains were chopped and did not stop up the pipe. The cost of aeration was small in comparison with the devices for liquid manure mixing.