EFFECT OF AGROBIOLOGICAL RECLAMATION ON THE SOIL ABSORBING SOLONETS COMPLEX OF BARABA LOWLAND

The studies were conducted in the northern forest-steppe of the Baraba lowland on the territory of Novosibirsk region. The genetic profiles of crusty solonets on virgin soil and arable land were analyzed. Soil samples were selected in 2015-2016 from genetic soil horizons on the depth of 100 cm, then drilling every 20 cm to the groundwater. The effect of long-term application of agrobiological soil reclamation method on solonets profiles was studied on the experimental site. The stationary experiment was laid in 1987. The study of the morphological structure of soil profiles and the physicochemical properties of crusty solonets subjected to long-term agrobiological reclamation showed that certain changes occurred in the soil profile. The columnar structure of the solonets (illuvial) horizon was destroyed by agro-technical treatments and plant roots. In addition, under the action of agrobiological soil reclamation, the physicochemical properties of the soil changed. It was established that the concentration of calcium ions in the soil absorbing complex of the solonets (in the illuvial) horizon increased from 27.1 to 64.5%, and the content of sodium and magnesium cations decreased from 38.2 and 26.4 to 32.4 and 1.1% respectively. Solonets turned into residual type from the multi-sodium one. The effect of agrobiological soil reclamation became evident in the change of the overall medium reaction. On the virgin soil, the pH value in the solonets horizon (45-60 cm) was 9.1, while on the arable land it was only 6.5. The agrobiological method of soil reclamation not only increased the productivity of agrolandscapes, but also had a positive impact on the physicochemical properties of the solonetz soils of Baraba lowland and their genetic profile.