Soil resistivity

Bruand, Ary & Richard, Guy (2005). “Electrical resistivity survey in soil science: a review” (PDF). Soil and Tillage Research 83 (2): 173-93. doi:10.1016/j

1021/ie030358e. "(observed five) orders of magnitude decrease in the electrical resistivity of charcoal with increasing HTT from 650 to 1050°C"  ^ Kwon, Jin Heon;