Agrochemical properties of irrigation-eroded meadow-seriozem soils of the Zerafshan River valley

This study evaluates the factors and conditions leading to irrigation erosion during tobacco cultivation on irrigated meadow-gray soils of the Zeravshan River valley.The effects of irrigation regime, field slope, and soil structural degradation on erosion development were assessed.Quantitative losses of soil organic matter and essential nutrients were determined, with particular emphasis on nitrogen forms as the main limiting factor of soil fertility.The impact of irrigation erosion on the group and fractional composition of humus, total nitrogen content, and the distribution of mineral nitrogen forms (NH₄⁺ and NO₃⁻) within the soil profile was analyzed.Results showed that irrigation erosion intensifies organic matter depletion, accelerates nitrogen mineralization and leaching, and reduces the reserves of plant-available nitrogen.These processes negatively affected tobacco growth and yield.The findings demonstrate that mineral nitrogen depletion is a key consequence of irrigation erosion in meadow-gray soils.Based on the results, practical recommendations were developed to reduce erosion intensity, conserve soil nitrogen reserves, and improve nutrient-use efficiency, thereby enhancing the sustainability and productivity of tobacco cultivation under irrigated conditions.

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