Factors affecting methane (CH4) emission from tidal swamp rice field

Abstract

Methane (CH4) emission from tidal swamp rice field was determined from June to October of 2005 (dry season) using an automated closed chamber technique. This study was carried out with the objectives to measure CH4 emission from tidal swamp rice field and determine the controlling factors affecting the emission. Four rice varieties i.e. Punggur, Martapura, Sei Lalan and Indragiri were used as the treatment and arranged in a completely randomized block design with three replications. The soil was collected from a coastal area of Demak District. The soil was transported to Jakenan experimental farm of Research Station for Agricultural Environment Preservation (RESAE) and placed in microplots. Plant growth parameters, soil redox potential, soil pH and soil temperature measurements were conducted during rice growing season. The result showed total CH4 emission varied between 105.44 kg/ha to 200.33 kg/ha. There was significant relationships between CH4 flux with soil redox potential, soil temperature, dry matter weight (DMW) of root, DMW of aboveground biomass, DMW of total biomass and numbers of plant tiller.