The increase in the biofuel production has generated a lot of byproducts. These are rich in various plant nutrients. The laboratory incubation can provide an idea of their effects on soil and environment, and fertilizer applicability before field application. In the present study, two types of biogas byproducts were selected as biochar and digested liquid. Two concentrations of each was applied to the paddy soil (Regosol), and incubated under the submerged conditions. Biochar treated soil produced the highest methane and carbon dioxide than the untreated soil due to high carbon content. Digested liquid treated soil produced the lowest concentration of both gases even lower than the control. It may be because of toxic effects of ammonium-N on methanogens. Digested liquid treated soil produced the highest nitrous oxide; whereas difference was not significantly different for the control and biochar treated soil. However, cumulative production of each gas showed that production of nitrous oxide was negligible in each treated soil due to the waterlogged condition. As expected, each treated soil produced little nitrate under this experimental set up.
Greenhouse gases production was checked under the influence of biogas byproducts Biochar significantly increased CO2 and CH4 production Digested liquid significantly decreased CO2 and CH4 production even lesser than the control Digested liquid increased N2O production
biogas, biochar, digested liquid, CO2, CH4, N2O
