CO₂ EMISSION FROM TYPICAL SLIGHTLY ERODIED CHERNOZEM SOIL UNDER AGROBIOTECHNOLOGY APPLICATION CONDITIONS

The purpose of the presented work was to study the intensity of СО₂ emission from typical slightly eroded chernozem under the conditions of agrobiotechnology application. Field studies on the use of microbiological preparations (MP) based on Trichoderma and Lactobacillus with nitrogen fertilizers (ammonium nitrate – 10 kg active ingredient N per 1 ton straw) or lime (1.5 t/ha) using by-products (BP) of crops for fertilizer have been carried out since 2018 on the territory of the experimental field of the Federal State Budgetary Scientific Institution "Kursk Federal Agricultural Research Center" (Kursk Region, Medvensky District, Panino Village). Soil respiration analysis was carried out in 2022 under crops of common oats (Avena sativa L.) variety "Borets" and in 2023 under crops of white lupine (Lupinus albus) variety "Dega" in a grain crop rotation. The experimental design is presented by the following variants: Control (without fertilizers and PP); Chopped PP crop; PP + 10 kg active ingredient N per 1 ton of PP; PP + lime 1.5 t/ha; PP + MBP; PP + MBP+ 10 kg active ingredient N per 1 ton of PP; PP + MBP + lime 1.5 t/ha. An increase in the intensity of СО₂ emission from the soil under oat and lupine crops in relation to the control was noted during the flowering phase from 23.2 to 96.8% and 27.1 to 87.7%, respectively, depending on the experimental components. A high correlation dependence of CO₂ emission from the soil on the experimental factors was established under oat (r = 0.96) and lupine (r = 0.91) crops, subject to agrobiotechnology.