The purpose of this work is to obtain and evaluate the fertilizing ability of the clay-nitrogen mixture. The relevance of the research lies in studying issues related to the minimization of nitrogen losses when producing the clay-nitrogen fertilizer, the transformation of nitrogen from fertilizer into the soil, and the effectiveness of fertilization when growing barley. The data on the content of nitrate nitrogen (250,986 mg/kg) and the total one (5.0%) indicate the effective binding of nitric acid by clay. The fertilizer can be considered potassium-containing, since the content of mobile and total potassium is respectively 1,250 mg/kg and 0.20%. Mobile phosphorus in the fertilizer is low compared to potassium (76 mg/kg), although the total pool is twice as large (0.45%). The content of the gross form of copper (8.9 mg/kg) and zinc (9.5 mg/kg) corresponded to the MPC.
The mineralogical composition of clay loamy agro-gray soil and the content of nutrient elements in the soil and its fractions were determined. This allowed estimating the nutrient supply and natural productivity of the soil. The long-term use of soils with the application of mineral and organic fertilizers affected the soil mineralogy: both aggradation and degradation processes were observed. The fertilizing system recommended for application to the agro-gray soil did not affect the crystal-chemical parameters of soil minerals. However, soil acidification and changes in the humus fractional composition towards increasing the content of fulvic acids show intensive degradation of soil minerals, which can lead to adverse consequences for soil fertility.
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