Charcoal Carbon in U.S. Agricultural Soils Skjemstad, Jan O. ; Reicosky, Donald C. ; Wilts, Alan R. ; McGowan, Janine A. Abstract Publication: Soil Science Society of America Journal Pub Date: 2002 DOI: 10.2136/sssaj2002.1249 Bibcode: 2002SSASJ..66.1249S