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Increasing the organic matter in the soil leads to both a rise in biodiversity and productivity of ecosystems in general. This increase results in improvements of quality and productivity of soils, too. This can be done by introducing organic matter with the help of specialized equipment. With reference to this, the present paper outlines the technical parameters and performance capacity of such a device developed at Ruse University "Angel Kanchev".

Designed in Bulgaria for the needs of organic, environmentally-friendly and conventional agriculture, the universal composting machine requires to be attached to the front of tractors when being used in aggregates. However, it is rare to fi nd such tractors. What is more, tractors with front -sha power take almost do not exist. For this reason the universal composting machine is rather limited from a technological point of view despite its capacity and this made it necessary to improve it through the development and testing of a hydraulic power drive system. The purpose of the present study is to discuss the technical and technological changes in the design of the composting machine which have resulted in increased performance under conditions of sustainable agriculture in Bulgaria.