Biosolvent-assisted leaching and soil-solution salinity in an irrigated light sierozem, Nishon district, Uzbekistan (2025–2026)

Field dataset from a preliminary experiment testing Biosolvent (polymaleic acid-based soil conditioner, 10 L ha⁻¹) before a single leaching application (4000 m³ ha⁻¹) on a weakly saline, chloride–sulfate, medium-loam light sierozem in Nishon district, Kashkadarya region, Uzbekistan. Eight 10 × 10 m plots (n = 4 per treatment) were sampled at 0–30, 30–70 and 70–100 cm in September 2025 and March 2026. The file contains layer-level 1:5 water-extract data (EC₁:₅, pH, dry residue, HCO₃⁻, Cl⁻, SO₄²⁻, Ca²⁺, Mg²⁺, Na⁺, SAR, bulk density), the randomization record, plot-level profile values, ANCOVA results, salt-stock and salt-balance calculations, and salinity-type classification. See README.txt for definitions and units. Supplementary data for the manuscript cjss-2026-0093 (Canadian Journal of Soil Science).