EROSION TRANSFORMATION UNDER IRRIGATION OF THE SUBTROPICAL STEPPE IN THE AZERBAIJAN REPUBLIC
Abstract
A decrease in producing capacity of irrigated gray-brown soils as influenced by erosion was revealed. The object of study was irrigated gray-brown soils in the Mil-Karabakh steppe of the Kura-Araz Lowlands in the arid subtropical zone of Azerbaijan. The eroded accumulative process is observed in the areas with the slope of more than 0.004° and in the irrigated plots. It has been found that 4–8 tons per ha of deposits together with the irrigation water enter the soil surface during the vegetation period. At the same period, 3.25–18.78 tons per ha of soil, 99–158 kg/ha of humus, 0.9–16.4 kg/ha of nitrogen and 0.80–39.73 kg/ha of phosphorus are levigated as a result of erosion. Resulted from soil transformation were revealed plots with strongly, moderately and slightly washed soil as well as aggradations and unwashed plots. Changes in morphogenetic, morphometric and diagnostic parameters of soil in these plots were observed. A higher content of the sludgy fraction in the solid runoff, as compared with its quantity in soil, was revealed. As water moves over furrows and drains, the chemical composition of the solid runoff changes: the contents of humus, total nitrogen and phosphorus increase. The depth of carbonate deposition in the aggradation shelf makes up 45–50 cm from the soil surface, 10–12 in the upper part of a slope, 15–18 in the middle, and 25–28 cm in the bottom. In the slope aggradation, where the rate of water movement along irrigation furrows drops, the fine soil drifted accumulates, and the humus horizon is getting deep. The carbonate profile in aggradations even out at the levels of magnitudes typical for the upper horizon of gray-brown soils.
About the Author
E. A. Gurbanov
Azerbaijan Architecture and Construction University
Azerbaijan
Azerbaijan
Candidate of Science in Agriculture, Associate Professor,
11, A. Sultanova St, Baku, 1073
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Review
For citations:
Gurbanov E.A. EROSION TRANSFORMATION UNDER IRRIGATION OF THE SUBTROPICAL STEPPE IN THE AZERBAIJAN REPUBLIC. Siberian Herald of Agricultural Science. 2017;47(3):89-94. (In Russ.)
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