1. 1. Medvedyev V.V., Lyndyna T.E., Laktyonova T.N. (2004). Soil density (genetic, ecological and agronomic aspects). Kharkiv. 244p.
2. 2. Mazur H. A. Reproduction and regulation of light soil fertility. (2008). Kyiv, 305 s.
3. 3. Balaev, A., Pikovska, O., Tonkha, O. (2019). Content of humus and labile organic substances with different use of typical chernozem. Scientific journal "Crop and Soil Science" [S. l.], Kyiv. v. 286, p. 173-179.
4. 4. Shykula N. K., Nazarenko H.V., Balaev A.D., Kapshtyk M.V. Influence of long plowless processing on the maintenance and quality of humus (1987). Journal of Agriculture № 4. Kyiv, p. 24-27.
5. 5. A. M. Lykov M.V. (1983). Organic matter and fertility of sod-podzolic soil. Journal of Agriculture № 2. Moscow. P. 12-15.