Dynamics of labile organic compounds of light-gray forest surface gleyed soils at long-term agrogenic influence

Abstract

Goal. To study the dynamics of labile organic compounds of light gray forest surface gleyed soil in the process of spring barley vegetation depending on the long-term application of different fertilizer systems and periodic liming. Methods. Field research, physicochemical and comparative analytical. Results. The content of labile humus in the arable layer of acidic light gray forest soil is insignificant and does not exceed 0.73%. Mineral fertilizer systems with long-term use cause the lowest content of labile humus compounds, which does not exceed 0.50% during the growing season. Application of organomineral fertilizer systems with application per 1 ha of crop rotation area of one norm of mineral fertilizers (N65P68K68), 10 t/ha as manure on the background of liming with a dose of CaCO3, calculated on hydrolytic acidity and acid-based buffering provides during the growing season almost the same contents of labile (0.49 – 0.60%) and water-soluble organic (0.025 – 0.042%) matters. The lack of fertilizer during the spring barley vegetation caused the lowest indicators of water-soluble organic matter (0.013–0.02%) in the control variant. Conclusions. The supply of light gray forest surface gleyed soils with labile forms of organic matter under conditions of long-term agrogenic exposure varies depending on the fertilizer systems and their use.