Poulton, P. ., Johnston, J. ., MacDonald, A. ., White, R. ., & Powlson, D. . (2018). Major limitations to achieving "4 per 1000″ increases in soil organic carbon stock in temperate regions: evidence from long-term experiments at Rothamsted Research, UK. Global Change Biology. https://doi.org/10.1111/gcb.14066 (Original work published 2018)