At the quantitative level on the basic parameters described in the fertility of the virgin chernozems in zonal-subzonal aspect. The article traces the changes in nitrogen and humus condition at an early stage of development. In terms of reserves of humus and nitrogen chernozems forest steppe and steppe have significant differences: the largest reserves of humus and nitrogen are concen... https://www.findingthestory.com/product-category/pipe-tools/