агрохімічні показники

Purpose. The study of changes in the main agrochemical parameters in the upper layers of the gray forest soils of the Left Bank Forest-Steppe of Ukraine that were removed from agricultural processing and forested with pine, in different years. Methods. Theoretical methods included the collection and description of facts, their analysis. Empirical methods involved conducting field research on test plots of the state-owned enterprise “Chu-guevo-Babchansky LG” and farm near woodlands. Laboratory and analytical studies were performed using standardized measurement methods. The generalization of the experimental data was performed using applica-tion software packages. Results. Studies were carried out on soils under natural forest plantations, soils in inten-sive agricultural processing and unproductive soils that are derived from agricultural use. In all the studied soils, the main agrochemical parameters were compared among themselves: mobile forms of nitrogen, pH, humus content, content of common forms of nitrogen, phosphorus and potassium. Statistical dependences between agrochemical parameters in the studied variants were established. Conclusions. The results obtained indicate the revitalization and development of humification and accumulation of nutrients in old arable gray forest soils with an increase in the duration of exposure to pine forest. The age stages of the forest determine the specifics of the environmental factors that influence the soil-forming processes. In the soil of a young pine-tree (12 years), there are more cases of an increase in the coefficients of spatial variation. This indicates that the formation of young ecosystems are characterized by low resistance, in these biocenoses the dynamic equilibrium is not reached, which is characteristic of more mature pine forests.

The high rate of urbanization in the second half of the last century led to not only to the growth of urban population, but also as a result to increasing of amount of production wastes. During solving problems with mu-nicipal wastewater treatment inevitably the problem of disposal of sewage sludges is arised. Purpose is to pro-vide agroecological substantiation of possibility of application of sewage sludge of Kharkov in the agricultural sector. Methods. Analytical, laboratory modeling and statistics. Results. Agrochemical and ecological assess-ment of sewage sludge of WWTP "Bezlutskiy" at Kharkov are given, compliance with the requirements of nor-mative documents and substantiation of possibility of application of sewage sludge in the agricultural sector are established. Conclusions. It is found that sewage sludge contain sufficiently high amount of organic matter (more than 52 %) and major nutrients (total nitrogen and phosphorus) as well as acceptable concentrations of micronutrients and heavy metals according to the requirements of normative documents. Prospects of sewage sludge application as fertilizer is established.