Effect of prolonged use of certain elements of agrotechnology on the fertility of gray forest soil in the subtaiga zone of the Omsk Irtysh region

In a stationary experiment, the fertility of gray forest soil was assessed depending on the type of crop rotation and the use of mineral fertilizers. The object of the study is gray forest soil. The scheme of the experience is two-factor (2 × 2). Factor A – 4-full grain-steam crop rotations 1 and 2, characterized by different saturation of grain crops and the type of steam. Factor B – mineral fertilizers, options: 1 – without fertilizers (Y0), 2 – N30P45K45 (Y1). The observation period was 20 years (2003–2022). It was revealed that the replacement of pure steam with occupied steam, the introduction of leguminous crops (peas) stabilized the humus content in the soil due to a greater intake of mortmass, with high e.e. nitrogen enrichment (C : N = 9.9). The systematic use of phosphorus-containing fertilizers in crop rotations at a dose of P45 ensured a positive balance of this element in the soil. It was found that in the conditions of the subtaiga zone, due to the scientifically based selection of crops in crop rotation, their productivity increased by 0.21 t/ha and by 0.30 t/ha with the use of fertilizers (N30P45K45).