The science of soil carbon stock measurement is emerging and continues to evolve. Each methodology has its strengths and weaknesses. Taranis believes that using a procedural model provides results which are sufficiently accurate for our purposes, namely long-term trends of soil organic matter and change in carbon stocks compared to a baseline. Taranis has engaged soil scientists to advise and review our implementation of the DayCent model. The implementation of the model includes calibration procedures relying on ground truth soil samples collected over the past two years.