eng Oriental Scientific Publishing Company Biosciences Biotechnology Research Asia 0973-1245 2016-12-22 13 4 1983 1988 10.13005/bbra/2353 17309 article Maxat Amantaiuly Amantayev 1 Gayaz Zakirovich Gaifullin 2 Valentina Gennadevna Kushnir 2 Serik Zakirovich Nurushev 2 Ruslan Ivanovich Kravchenko 2 S.Seifullin Kazakh Agro Technical University, Kazakhstan, 010000, Astana, Prospect Pobedy, 62. Kostanay State University A.Baitursynov, Kazakhstan, 110000, Kostanay, Abay avenue, 28. In this paper are presented the results of the experimental researches being carried out under controlled soil bin conditions to study the soil-free rolling rotary tillage tools interaction. There were investigated six different types of the rotary tillage tools. Observations showed that during the operation in front of the working surface of all rotary tillage tools the compacted soil bodies are built up. Cross section of the fixed soil bodies has the configuration of wedge of two types. The first type of the soil wedge is characterized by the apical angle equaled 90º–φ₁ where φ₁ is the soil internal friction angle. This type of soil bodies is built up on the working surface which is limited in height. Cross section of the soil bodies fixed in front of the interface of the solid tillage tools has the configuration of wedge of the second type; its parameters are widely varied depending on the sweep and tilt angles. The quality of the work and dynamics of the tillage implements depend on the generated soil body parameters rather than the design parameters of the tillage tools. https://www.biotech-asia.org/vol13no4/soil-body-formation-in-front-of-the-rotary-tillage-tools/ rotary tillage tool; disc tillage tool; soil body formation; fixed soil body; soil wedge; soil wedge parameters