Abundant and Stable Char Residues in Soils: Implications for Soil Fertility and Carbon Sequestration Mao, J. -D. ; Johnson, R. L. ; Lehmann, J. ; Olk, D. C. ; Neves, E. G. ; Thompson, M. L. ; Schmidt-Rohr, K. Abstract Publication: Environmental Science and Technology Pub Date: September 2012 DOI: 10.1021/es301107c Bibcode: 2012EnST...46.9571M