Data for: Mineral-nutrient relationships in African soils assessed using cluster analysis of X-ray powder diffraction patterns and compositional methods

The dataset contains soil X-ray powder diffraction (XRPD) data and associated soil properties for subsoil samples from the AfSIS Sentinel Site survey. As such it represents data from 60 Sentiel sites across sub-Saharan Africa, acconting for a wide range of agro-ecological environments.

The 'xrd.zip' file contains the 935 soil XRPD patterns. Each XRPD file is in space separated ASCII format. The first column is 2theta (i.e. x-axis) and second column is the counts (i.e y axis).

The 'clusters_and_properties.csv' contains the associated site and soil information for each XRPD measurement, including:
-SSN: a unique identifier used to link the soil property and XRPD data
-Sentinel_site: The name of the Sentinel site
-Latitude: latitude in decimal degrees
-Longitude: longitude in decimal degrees
-xrpd_cluster: A numeric factor of 1 to 9 denoting the mineralogical cluster of the soil, defined from cluster analysis of the XRPD data
-xrpd_cluster_subset: A logical column denoting whether the data are included in the subset clusters of the associated manuscript
-pH: soil pH
-TOC: Total organic carbon concentration (mg/kg)
-K, Ca, Mn, Fe, Ni, Cu and Zn: Total element concentrations analysed by total X-ray fluorescence spectroscopy (mg/kg)
-m3.B, m3.Mg, m3.K, m3.Ca, m3.Mn, m3.Fe, m3.Cu and m3.Zn: Extractable element concentrations determined via Mehlich 3 extraction (mg/kg)