International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The use of complex mineral, organo-mineral and organic fertilizers on Haplic Chernozems for 8 years lead to changes in the composition of soil organic matter. These fertilizers without the use of mineral N fertilization have a positive effect on the values of +NH4-N, available and total phosphorus in the soil, as well as cation exchangeable potassium.
Certainly organic fertilization as well as its combination with multicomponent mineral fertilizer has a positive impact on the agrochemical status of the soil. The potential nitrogen supplying capacity of the soil determined on the 28th and 56th days of incubation significantly increased the amount of mineralized nitrogen. The same was highest in the use of the organic fertilizer ExcelOrga, where the excess over the control in the values of net mineralizing capacity was 24.20%.

The use of complex mineral, organo-mineral and organic fertilizers on Haplic Chernozems for 8 years leads to changes in the composition of soil organic matter. Certainly the organic fertilizer ExcellOrga and its combination with the complex mineral fertilizer Suprefos increase the content of soil organic carbon, and humic acids, related with calcium. A positive trend is also the increase of carbon in insoluble residue. A statistically reliable positive influence of organic and organo-mineral fertilization on individual groups and fractions compared to those in the control variant was established. The trend is especially well expressed on the carbon values of humic acids and those related to calcium. This leads to a sustainable level of humification and an increase in the share of agronomically valuable groups and fractions in the organic carbon of the soil.