Abstract
In the semi-desert regions of Azerbaijan there are habitats with varying elevations of only a few tens of centimeters. The zonal soils on the territory of the massif are gray-brown soils. Gray-brown soils develop under ephemeral plant cover. The soil is carbonate throughout the entire profile. Below the carbonate horizon lies a layer enriched with sulfates in the form of veins of crystalline gypsum. The content of absorbed sodium in the gray-brown soils of the deluvial plain of the Siyazan-Sumgait massif is 30-50% of the number of absorbed bases in the Solonetz-Columnar soil horizon. The amount of humus in the upper layers of the soil fluctuates between 1-2%, towards the bottom it sharply decreases. In studies carried out on gray-brown soils of the Siyazan-Sumgait massif, hydrothermal potential indicators vary within the range of 426-552 m3/ha. The distribution of temperature and humidity in depth in the soil under wheat differs from the natural habitat. In the arable layer, the temperature is evenly distributed throughout the entire profile, while the humidity gradually increases in the lower layers. The influence of the hydrothermal regime on wheat yield was: 2022 — 24.0-30.0 cwt/ha; 2023 — 16.0-24.5 cwt/ha.
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