Temporal Changes in Salinity and Agrochemical Parameters of Light Sierozem Soils Near A 500 Kv Power Transmission Line in The Fergana Valley
Abstract
This study examines changes in salinity and agrochemical parameters of light sierozem soils at experimental site No. 2 near a 500 kV power transmission line in the Fergana Valley. The site has a soil bonitet rating of 58. The aim was to assess changes in soil parameters during 2023–2025 and identify differences between the 0–20 and 20–40 cm layers. A comparative analysis was conducted of humus content, pH, phosphorus and potassium contents expressed as P₂O₅ and K₂O, and salinity. During the study period, salinity increased from 0.38 to 0.42% in the upper layer and from 0.43 to 0.47% in the lower layer. Humus content decreased from 1.10 to 1.05% and from 0.82 to 0.76%, respectively, while pH increased from 7.70 to 7.90 and from 7.90 to 8.10. P₂O₅ content decreased from 22 to 20 mg/kg in the 0–20 cm layer and from 16 to 14 mg/kg in the 20–40 cm layer; K₂O content decreased from 255 to 240 and from 225 to 210 mg/kg, respectively. Throughout the observation period, the lower layer had higher salinity and pH but lower humus, phosphorus and potassium contents. The findings show concurrent increases in salinity and pH and decreases in humus and nutrient contents. Establishing the contribution of electromagnetic exposure to these changes requires field measurements, comparison with a control site, and consideration of the water regime and agricultural management practices.
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References
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