REPUBLIC OF KOREA (SOUTH KOREA)
The first evaluations of SRI methods in the Republic of Korea were undertaken in 2007 by Dr. Jinyong Choi, professor of sustainable agriculture at Gyeongsang National University (GNU), with thesis research on SRI methods used with a vetch residue-mulched no-till system. During 2011, two related articles on planting densities and nutrient uptake by Vannak Meas and colleagues suggested SRI methods should be useful for small-scale rice farmers in Korea as a sustainable farming system.
During 2011-2012, Dr. Joong-Dae Choi at Kangwon National University presented evidence that SRI methods can reduce water-use, non-point source (NPS) pollution and GHGs under Korean conditions. According to Dr. Choi, conservation of water resources by Korea's agricultural sector is one of the most important pending issues as it consumes nearly half of the nation's water supply and about 90% of agricultural water use is consumed in paddy farming.The research also showed large reductions in methane emissions and only small increases in nitrous oxide, amounting to a net reduction of two-thirds in GHG emissions evaluated in terms of CO2 equivalence (see article and PowerPoint presentation). These findings are especially important since there has been some question as to whether the expected methane reductions with SRI might be offset by significant increases in nitrous oxide, also a potent greenhouse gas.
- Kangwon National University Research Shows SRI Influence on Pollutants and GHGs
At the 2011 international meeting of the Paddy and Water Environment Engineering Society held in Taipei, research on SRI methods was reported by Dr. J. D. Choi from the Department of Regional Infrastructure Engineering of Kangwon National University. This work focused on reductions in the pollutants in water runoff from SRI plots compared to conventionally-cultivated rice paddies (see journal article). At the same meeting, he reported on research assessing reductions in greenhouse gas (GHG) emissions with SRI management. The research showed large reductions in methane emissions and only small increases in nitrous oxide, amounting to a net reduction of two-thirds in GHG emissions evaluated in terms of CO2 equivalence. (see PowerPoint presentation). This research, undertaken at the plot locations shown at right, is ongoing. (Click on map for a larger view).
During May 2012, Dr. Choi presented additional findings on the reduction of non-point source pollution and GHG emissions at the International Water Association (IWA) World Congress for Water, Climate and Energy, Dublin, Ireland. (See abstract - the full paper will be made available soon).
- Articles on SRI with No-Till Published in Korean Journal of Soil Fertility
Two articles by Vannak Meas and his colleagues were published subsequent to Meas' 2008 MSc thesis on SRI adapted with a Chinese milk vetch residue-mulched no-tillage cropping system on silt loam soil. Both articles discuss paddy planted at planted with 10x10 cm, 20x20 cm and 30x30 cm spacings using no-till methods. Root dry mass was significantly increased in the wider planting densities (p<0.05%), with the highest grain yield obtained in the 20x20 cm planting density plot (p<0.05%) due to higher plant density per unit area and spikelets number per panicle. The total nutrient uptake amount by rice plants was significantly higher with 20x20 cm planting density. Findings of both articles suggest that optimum planting density for SRI in no-tillage paddy was 20x20 cm and that SRI methods should be useful for small-scale rice farmers in Korea as a sustainable farming system. (Journal articles in 2011 are listed in the research section below.)
Gyeongsang National University Researchers Study SRI Adapted to Vetch Residue-Mulched No-Till System
The first evaluations of SRI methods, as far as we know, were undertaken by Dr. Jinyong Choi, professor of sustainable agriculture at Gyeongsang National University (GNU), in 2007, with thesis research on SRI methods adapted with a Chinese milk vetch residue-mulched no-till system. In 2008, his student, Vannak Meas, finished a thesis entitled "Evaluation studies on applicability and strategies for improvement of SRI (System of Rice Intensification) with direct seeding Chinese milk vetch residue-mulched no-till paddy rice (Oryza sativa L) in Southern Korea."
In 2009 a delegation of GNU students visited Cornell to learn more about SRI methods and soil health.
- Jung, Chung-Gil, Jong-Yoon Park, Seong-Joon Kim and Geun-Ae Park. 3013. The SRI (system of rice intensification) water management evaluation by SWAPP (SWAT-APEX Program) modeling in an agricultural watershed of South Korea. Paddy and Water Environment 10.1007/s10333-013-0367-1 (technical report; results showed that water could be saved and the nutrient load reduced by just applying SRI water management for rice paddies in South Korea.)
- Choi, Joong-Dae, Woon-Ji Park, Ki-Wook Park, Guenyeob Kim, and Deog-Bae Lee. 2012. Effect of SRI on the reduction of irrigation requirement and NPS pollution discharge from runoff plots in Korea. Abstract of paper presented at the International Water Association (IWA) World Congress for Water, Climate and Energy, Dublin, Ireland, May 14-17.
- Choi, Joong-Dae, Woon-Ji Park, Ki-Wook Park, and Kyong-Jae Lim. 2012. Feasibility of SRI methods for reduction of irrigation and NPS pollution in Korea. Paddy and Water Environment Online first (Springerlink) 1-8. doi:10.1007/s10333-012-0311-9
- Meas, Vannak, Daniel Shon, and Young Han Lee. 2011. Effects on rice growth of System of Rice Intensification under no-till paddy in Korea. Korean Journal of Soil Fertility (한국토양비료학회지) 44(1): 91-97. (First two pages are available at http://www.papersearch.net/view/detail.asp?detail_key=09405133)
- Meas, Vannak, Daniel Shon, and Young Han Lee. 2011. Impacts of planting density on nutrients uptake by System of Rice Intensification under no-tillage paddy in Korea. Korean Journal of Soil Fertility (한국토양비료학회지) 44(1): 98-103. (First two pages are available at: http://www.papersearch.net/view/detail.asp?detail_key=09405134)
- Meas, Vannak. 2008. Evaluation studies on applicability and strategies for improvement of SRI (the Systems of Rice Intensification) with direct seeding Chinese milk vetch residue-mulched no-till paddy rice (Oryza sativa L) in Southern Korea. MSc. thesis. Gyeongsang National University, South Korea.
- 2009 (May 24). System of Rice Intensification. Korean Hangul
Language version of the original SRI video by the Adventist Development and Relief Agency (ADRA) about
SRI in Indonesia. (in three parts). danafastforward channel, YouTube.
Part I: 8:59 min.; Part II: 10:39 min.; Part III: 5:14 min.
Choi, Joong-Dae. Woon-Ji Park, Ki-Wook Park and Kyong-Jae Lim. 2011. Feasibility of SRI application in Korea for reduction of irrigation requirements and non-point source (NPS) pollution. PowerPoint presented by Joong-Dae Choi at the Paddy and Water Environment Engineering Society PAWEES International Conference, Taipei, October 27. 47 slides.