Sokchea H, Borin K and Preston T R 2013:
Effect of biochar from rice husks (combusted in a downdraft gasifier or a paddy rice dryer) on production of rice fertilized with biodigester effluent or urea.
Livestock Research for Rural Development. Volume 25, Article #4.
Retrieved
, from http://www.lrrd.org/lrrd25/1/sokc25004.htm