This paper presents the review of the current state of agricultural land based on GIS technologies using materials of Earth remote sensing on the example of the foreststeppe zone of Western Siberia which is the most developed and populated territory of this region. We used multispectral images of the Landsat 8 spacecraft (SC) (USA) with a resolution of 30 m per pixel. These images allow monitoring of the Earth's surface every 16th day with a flying-by width of 185 km in nadir. Computer processing of the series of multispectral satellite images (MSI) using the method of synthesizing (superposition of the long and short wavelengths of solar radiation spectrum) was carried out using the licensed software package ENVI 5.0. (produced by ESRI company). During creating electronic cartographic material of the studied area (based on satellite data), a digital basis for agricultural lands was made at first. Digitalization of outdated material was performed using QGis software package (desktop GIS for creating, editing, visualizing, analyzing and publishing geospatial information. It is QGIS Desktop that is often meant by QGIS). For the first time, a spatial-temporal change in the structure of agricultural land of this region over the past twenty-five years was revealed using multi-temporal images made by Landsat 8 SC. Areas were found that have moved from the category of arable land to the fallow one, and were susceptible to flooding. A partial soil survey was conducted in the study area (with sampling for chemical analysis) to establish soil type according to modern classification in order to update soil maps and to create an electronic cartogram showing soil suitability based on their agricultural type. Costeffectiveness of the cluster method for soil and agrochemical survey of agricultural land was calculated.

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We assessed soil fertility of agricultural lands based on the relative index and the complex agrochemical index (CAI), which was calculated from the data on the content of humus, mobile forms of phosphorus and potassium, and the reaction of the environment. The reaction of the soil medium was neutral, with the exception of calcareous soils and solonetzes. The structural condition in the arable layer (0–20 cm) of the soils was assessed as good. Fractions, the most valuable from the agronomic point of view (10.0–0.25 mm), prevailed in the aggregate composition. In the soils of the Kormilovka and Lyubinsky districts, their quantity was below the optimal level and amounted to 60.9–61.9%. The content of the blocky fraction (> 10 mm) exceeded the critical level by 5.0–6.0%. The deviation from the optimal parameters indicated a low degree of physical degradation in the soils. The structural aggregates were not resistant to the destructive effects of water. The calculation of the CAI showed that the soils of the Kormilovka and Lyubinsky districts had the highest fertility, the estimated score was 66–95. The soil fertility of the Azov district was estimated at 53 points. Soils under fallow and forage lands had high CAI (71–100 points). The degree of cultivation of arable land was medium and high.

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