Ecological and agrochemical assessment of the sustainability of gray forest soil its fertility for growing crops is also adversely affected

The article presents research based on long-term field stationary experiments conducted at the agrotechnological experimental station of the UNIC "Agrotechnopark" to study the complex cultivation of gray forest soil of heavy loamy soil. The most favorable phosphate regime is soil with relatively high buffer properties, due not to the absorption of phosphorus by the solid phase, but its desorption. It was found that if the total acidification buffering capacity for pH intervals lies in the range of 9-11 mM–eq/100 g, then an average level of soil stability is achieved. In this case, the absorbed bases should be at least 20 mg-eq/100 g. It is not recommended to reduce the acidification buffering capacity to values less than 9 mM-eq/100 g. In long–term experiments with potash fertilizers, reliable increases in crop yields were established, which varied depending on the type of fertilizer and rotation in the range of 1.8 - 6.5 c/ha of grain units. On average, over 8 rotations, the increase was 5.0 c/ha of grain units. In the variant without fertilizers, the crop rotation productivity was about 24 c/ha of grain units. Keywords: GRAY FOREST SOIL, BUFFERING, NON-CHERNOZEM ZONE, PRODUCTIVITY, ORGANIC FERTILIZER, FERTILITY