Abstract—In total, 7444 fields with a total area of 857.9 thousand hectares were mapped on the territory of five eastern arid regions of the Stavropol krai. As of 2021, arable land occupies more than 55% of the study area and is located mainly in its western part. Winter crops occupy 4693 fields with a total area of more than 487 thousand hectares (56.9% of the total field area). Mapping of the contours of the fields was carried out on the basis of satellite images from Sentinel-2 (natural colors). The morphometric characteristics of the fields were calculated on the basis of the SRTM3 DEM. The mask of winter crops for the period 2011–2021 and weekly composites with data on the NDVI value for spring (March–May) were obtained using the VEGA-Science service. The areas of the fields identified according to remote sensing data are comparable with official statistics. The fields are located on lands with a steepness of up to 5°, the steepness of 1°–2° prevails (about 90% of the total area). Most fields have a predominant southern exposure, there are no fields with a northern exposure. There are 13 kinds of soils on the territory of the study area, chestnut deep soils are predominant. The average NDVI for March–May 2011–2021 shows the highest values in fields located on meadow soils, the lowest NDVI values are observed on salt flats and salt marshes. It was revealed that the NDVI value decreases with increasing field size, the optimal field size is up to 150 hectares. The highest NDVI values were found in fields with a steepness of 1°–2°, southern exposure and meadow, chestnut- and light-chestnut soils. The influence of annual precipitation amounts on the NDVI value is analyzed.
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The work was carried out within the framework of the state assignment of the Federal Scientific Center for Agroecology of the Russian Academy of Sciences Research work No. 122020100311-3, research work No. 122020100405-9.
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Doroshenko, V.V. Dependence of the Growing Season of Winter Crops on the Relief and Soils in the Eastern Stavropol Region. Izv. Atmos. Ocean. Phys. 59, 1483–1493 (2023). https://doi.org/10.1134/S000143382312006X
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DOI: https://doi.org/10.1134/S000143382312006X