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Effect of Irrigation Water Depth on Greenhouse Gas Emission in Paddy Field  

Lee, Kyeong-Bo (Honam Agricultural Research Institute, NICS RDA)
Kim, Jong-Gu (Honam Agricultural Research Institute, NICS RDA)
Park, Chan-Won (Honam Agricultural Research Institute, NICS RDA)
Shin, Yong-Kwang (National Institute of Agricultural Science Technology, RDA)
Lee, Deog-Bae (National Institute of Agricultural Science Technology, RDA)
Kim, Jae-Duk (Honam Agricultural Research Institute, NICS RDA)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.38, no.3, 2005 , pp. 150-156 More about this Journal
Abstract
The increasing emission of greenhouse gases may change agricultural environment. The agronomic productivity will depend upon change of temperature, precipitation, solar radiation and fertilization. This study was conducted to investigate greenhouse gas emission with irrigation water depth in paddy field. Area of each experiment plot is $70m^2$, Three treatments with three replications were carried out in this experiment, which was laid out as randomized complete block design. The treatments of irrigation water were maximum field water capacity and 4 and 8 cm depth. The application rate of fresh rice straw was $8,000kg\;ha^{-1}$ in combination with chemical fertilizers ($110kg\;N\;ha^{-1}$, $45kg\;P_2O_5\;ha^{-1}$ and $57kg\;K_2O\;ha^{-1}$). The $CH_4$ emission was highest at 32 days after rice transplanting with rice straw treatment. The $CH_4$ emission in the plot of maximum field water capacity was lower compared with 4 and 8 cm of irrigation depth. $CH_4$ and $N_2O$ emission under different water depth in the paddy field were 30 and $1.52kg\;ha^{-1}$ at 8 cm depth, 281 and $1.71kg\;ha^{-1}$ at 4 cm depth, and 219 and $2.01kg\;ha^{-1}$ at water saturated condition. The total emission of greenhouse gases equivalent to $CO_2$ emission with rice straw application were $6,939kg\;CO_2\;ha^{-1}$ at 8 cm depth plot, $6,431kg\;CO_2\;ha^{-1}$ at 4 cm depth plot and $5,222kg\;CO_2\;ha^{-1}$ at water saturated condition. The GWPs without rice straw application were $4,449kg\;CO_2\;ha^{-1}$ at 8 cm depth plot, $3,702kg\;CO_2\;ha^{-1}$ at 4 cm depth plot and $4,579kg\;CO_2\;ha^{-1}$ at water saturated condition.
Keywords
Greenhouse gases; Irrigation water depth; Paddy field;
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