Methane emission from a flooded rice field under pre-germinated system

Abstract

Local greenhouse gas flow measurement studies have been encouraged at a global level as a subsidy for national and state inventories. This study aimed to evaluate the seasonal methane emission during the 2008/2009 harvest, from an irrigated rice plantation, under pre-germinated system, in the municipality of Tremembé, State of São Paulo, using the static chamber technique and gas chromatography. The study showed high seasonal emission of methane (CH4) for the studied area, probably due to the long flooding period. It was estimated the CH4 emission factor (6.2 kg CH4 ha-1 dia-1), the partial global warming potential (pGWP, 26.2 Mg CO2eq growing season-1 ha-1) and the yield-scaled pGWP (YpGWP, 3.9 kg CO2eq kg grain).

Perspectives on carbon footprint of agricultural land-use in Brazil

“…Several studies have been developed in the last 20 years to measure the potential for GHG emissions in sugarcane production [11] , irrigated rice [12] , maize [13] , soybeans [14] , beans [15] , integrated crop-livestock system [16] , oranges [17] , beef cattle [18] , agroforestry systems [19] , eucalyptus [20] , and other land uses [21] . All of these case studies evaluated different soil management practices, with the emphasis on applying different sources of synthetic nitrogen fertilizers and the use of animal waste, seeking to develop specific methods for measuring GHG emissions suited to the environmental conditions of each production system [Table 2].…”