Soil nutrient status at three depths across 57 grid points, Kushtia, Bangladesh (2024)

Determinations were: organic matter by Walkley–Black wet oxidation; total nitrogen reported under the Kjeldahl method; available phosphorus by the modified Olsen procedure for neutral and calcareous soils; available sulfur turbidimetrically; available zinc by DTPA extraction; available boron by hot calcium chloride extraction; and exchangeable potassium by 1 N ammonium acetate extraction. Each observation carries WGS 84 coordinates, land use, land type, soil texture class, soil series, crop, and the SRDI (2020) fertility class for each property.

Data are supplied in tidy long format (171 rows) and in the original wide format (57 rows), with a data dictionary and the signed SRDI laboratory report. Users should note that total nitrogen in this dataset is an almost exact linear function of organic matter (TN = 0.0492 × OM − 0.0065; r = 0.978), indicating it was estimated from organic matter by a conversion factor rather than determined independently for every sample.

Any organic matter–nitrogen correlation computed from these data is therefore arithmetic rather than empirical. The dataset supports analyses of vertical nutrient distribution, soil fertility assessment against national classes, and geostatistical work on the spatial structure of soil properties in floodplain agriculture.