1.
Maize yield and nutrition during 4 years after biochar application to a Colombian savanna oxisol
by Major, Julie
Plant and soil, 2010-08-01, Vol.333 (1/2), p.117-128

2.
Modeling black carbon degradation and movement in soil
by Foereid, Bente
Plant and soil, 2011-01-01, Vol.345 (1/2), p.223-236
