Effect on growth of rice of biochar from rice husks or bagasse gasified in
downdraft gasifier or updraft gasifier stove
Huy Sokchea, Khieu Borin and T R Preston*
Center for Livestock and Agriculture Development (CelAgrid)
PO box 2423, Phnom Penh , Cambodia
huysokchea@yahoo.com
*Finca Ecológica, TOSOLY, UTA (Colombia)
AA #48, Socorro, Santander, Colombia
Abstract
A biotest was done using rice as indicator plant
to evaluate different sources of biochar (sugar cane bagasse or rice husk)
produced by downdraft gasifier or updraft gasifier stove, fertilized with
biodigester effluent (10 g N/m2). There were no effects of treatments on grain
yield. However, root biomass and total plat biomass were higher when the bagasse
rather than the rice husk was the substrate produced in the downdraft
gasifier than in the updraft gasifier stove (Figures 1 to 4). By contrast,
biochar from the rice husk was better than that from bagasse when the
updraft gasifier stove was used. The difference can be explained by the mode of
action of the two types of gasifier
Key words: Biomass, biotest, grain, root.
