Does soil type hold a role in the dynamic of carbon dioxide (CO 2 ) emission from paddy rice fields?

Soil holds a vital role in forming greenhouse gas (GHG) emission from paddy rice fields. There are three main GHG from paddy rice, namely Methane (CH 4 ), nitrous oxide (N 2 O) and carbon dioxide (CO 2 ). This research aimed solely to explore the dynamic of CO 2 emission from paddy rice with different soil types, namely sandy loam and clay soil. In each site, two-factor treatments were applied. There was water regime namely 1) continuously flooded, and 2) alternate wetting-drying (AWD) as the first factor and organic matter application namely 1) without organic matter (OM), 2) bio-compost 5 t ha -1 , and 3) bio-compost 10 t ha -1 . Carbon dioxide flux in sandy loam soil ranged between -11.50 to -0.47 mg CO 2 m -2 d -1 under continuously flooded conditions and -7.64 to 3.03 mg CO 2 m -2 d -1 alternate wetting-drying conditions. The clay soil was lower, ranging between -7.43 to 0.51 mg CO 2 m -2 d -1 under continuously flooded conditions and -5.54 to 0.47 mg CO 2 m -2 d -1 under alternate wetting-drying conditions. Clay soil tended to emit less CO 2 emission than sandy soil. The result showed that soil physical characteristic plays an important role in controlling CO 2 from paddy rice.