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The Steppe natural and climatic zone occupies southern part of the territory of Ukraine. The area of agricultural land is 17.617 million ha, of which 14.848 million ha of arable land that is 84.28%. In geomorphological relation the territory almost fully coincides with the Black Sea lowlands. The surface of the Steppe zone is plain, uneven in genetic and structural relation. Its southern area is situated on the territory of the Black Sea lowlands and is a slightly divided, and to the East of the river Ingul flat, with a great number of closed lowerings, plain. To the South of the Black Sea lowlands it gradually transforms into low (150-300 m) Besarab, Podil, Dnipro and Azov rises. The surface has general incline from the North (altitude of 150-170 m) to the South (altitude of 1-10 m). Plains are disrupted by river vales with terraces and right banks with a network of gulls. Dominant rock in the Steppe is loess, the power of which changes from 1 to 30 m. They are heavy-clay by granulometric structure, lightly clay within the Black Sea lowlands, moderately-clay – on the Azov rise, moderately and lightly clay on the terraces of the vale. Smooth plain relief favored to low erosion tension that provided for preservation of powerful, uniform on the great arrays clay loess cover. The soil cover of water-dividing plateau of the Steppe on the loess rocks is represented by chernozem and chestnut soils. Southern arid and Dry Steppe soil and ecological subzones of the Steppe zone occupy 5 million 761 thousand agricultural lands in five regions of Ukraine and Crimea, of which arable land occupies 4 million 507 thousand ha or 78.2%. The soil cover is represented by chernozem southern and chestnut soils. The main area of chernozem southern – 62.6% is occupied by model subtypes, 22.2% – micelle-carbonate, 15.1% – alkaline, 25% – eroded. The soils of the chestnut zone are divided into dark-chestnut and chestnut. The latter occupy a narrow strip along the Sivash with a total area of

EFFICIENCY OF THE SYSTEMS OF BASIC TILLAGE IN THE CROP ROTATIONS ON THE IRRIGATED LANDS OF SOUTHERN STEPPE OF UKRAINE