XXL Lysimeter Experiment — Fürth 2022–2026 dataset

Data, code and figures from the Carbon Drawdown Initiative XXL Lysimeter enhanced-weathering experiment on soil "Fürth 2022": twenty outdoor lysimeter pots (0.406 m² each), an unamended control plus basalt at 100/200/400 t/ha and a fine grind, sampled roughly monthly 2022–2026 for leachate total alkalinity (the CO₂-drawdown proxy), major ions, pH and electrical conductivity, with buried soil sensors (moisture, temperature, EC, pH and CO₂), on-site and official (DWD) weather, and feedstock characterization. The field, in-situ-instrumented companion to the Carbon Drawdown Initiative two-year greenhouse study. Includes reproducible Python code and all figures.