Use of digested slurry from livestock manure in paddy fields and its environmental effect in Southeast Asia
2017
Oritate, F.
Use of digested slurry from livestock manure in paddy fields and the associated environmental effects were examined using a regional diagnosis and field experiments with the aim of establishing a sustainable biomass use system in Southeast Asia. First, analysis of biomass use in a suburban village in Southern Vietnam identified several options for improving the regional environment and generating energy, resulting in a preferred proposal to use currently untreated livestock manure for biogas production and use digested slurry as a fertilizer in paddy fields. Second, the effects of using digested slurry as fertilizer on rice production and environmental impacts were evaluated through field experiments. This study clarified that digested slurry can be substituted for chemical fertilizers, and nitrogen loading and fecal contamination of receiving waters can be avoided if no water is discharged from the treated plot for a sufficient duration. Third, the economic feasibility of using digested slurry was evaluated in field experiments, which found that it is economically feasible if the nitrogen concentration of the digested slurry can be raised to five times that of present conditions. Finally, the effects of extending this regional scenario to all of Southeast Asia on nitrogen loads discharged to water bodies and on greenhouse gas emissions was estimated and evaluated.
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