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Long-term Impact of Single Rice Cropping System on SOC Dynamics  

Jung, Won-Kyo (National Institute of Agricultural Science and Technology, RDA)
Kim, Sun-Kwan (National Institute of Agricultural Science and Technology, RDA)
Yeon, Byung-Yul (National Institute of Crop Science, RDA)
Noh, Jae-Seung (National Institute of Agricultural Science and Technology, RDA)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.40, no.4, 2007 , pp. 292-297 More about this Journal
Abstract
Global warming and climate changes have been major issues for decades andvarious researches have reported their impact on our environment. According to recent researches, increased carbon dioxide ($CO_2$) concentration in the atmosphere is considered as a dominant contributor to global climate changes and thus numerous researches were conducted to control $CO_2$ concentration in the atmosphere. Soil management practices, such as reducing tillage intensity, returning plant residues, and enhancing cropping system have recommended for restoring organic carbon into the soils effectively. However, few studies on soil carbon sequestration have reported for Korean paddy soils. Therefore, evaluation of soil organic carbon (SOC) dynamics in the long-term single rice cropping system is essential in order to find out potential capacity of paddy field as a carbon sink source. The objective of this research was to evaluate SOC dynamics on the long-term single rice cropping system. Research was conducted in the research farm at National Institute of Agricultural Science and Technology, Rural Development Administration, Suwon. Long-term phosphorus and potassium fertilization and lime application didn't significantly affect on SOC compared to controls. We found that SOC contents were increased continually at the long-term composting plots with enhanced rate of carbon storage. In conclusion, continuous incorporation of plant residues (i.e., composting) is recommended to effectively sequester soil carbon for Korean paddy soils. This result implies that continuous composting in a paddy field may contributenot only for increasing SOC in the soils but also for mitigating global warming through reducing carbon dioxide emission into atmosphere. Therefore, we recommend that a strategy or policy measures to encourage farmers to return plant residues continuously for mitigation of global warming as well as soil fertility is being developed.
Keywords
Soil organic carbon; carbon sequestration; long-term rice cropping system;
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