Reducing Methane Emissions with Humic Acid–Iron Complex in Rice Cultivation: Impact on Greenhouse Gas Emissions and Rice Yield

Hyoung-Seok Lee, Hyo-Suk Gwon, Sun-Il Lee, Hye-Ran Park, Jong-Mun Lee, Do-Gyun Park, So-Ra Lee, So-Hyeon Eom and Taek-Keun Oh ()
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Hyoung-Seok Lee: National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
Hyo-Suk Gwon: National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
Sun-Il Lee: National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
Hye-Ran Park: National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
Jong-Mun Lee: National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
Do-Gyun Park: National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
So-Ra Lee: National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
So-Hyeon Eom: National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
Taek-Keun Oh: Department of Bio-Environmental Chemistry, Agriculture and Life Sciences, Chungnam National University, Daejeon 34134, Republic of Korea

Sustainability, 2024, vol. 16, issue 10, 1-14

Abstract: Methane emissions from flooded rice paddies are a major source of atmospheric methane and represent a significant greenhouse gas with high climate-forcing potential due to anthropogenic activities globally. For sustainable agriculture, it is necessary to find effective methods for mitigating greenhouse gas emissions without reducing crop productivity. We investigated mechanisms to reduce methane emissions during rice cultivation by applying rice straw, rice husk biochar, humic acid, and a humic acid–iron complex, assessing greenhouse gases and rice yield over a single season. The results demonstrated that the treatment plots with rice straw and the humic acid–iron complex significantly reduced methane emissions (563 ± 113.9 kg ha −1 ) by 34.4% compared to plots treated with rice straw alone (859 ± 126.4 kg ha −1 ). Rice yield was not compromised compared to the control group treated with only NPK fertilizer, and growth in terms of plant height and tiller number was enhanced in the plots treated with rice straw and the humic acid–iron complex. Conversely, the plots treated solely with rice husk biochar and humic acid did not show a methane reduction effect when compared to the NPK treatment. The humic acid–iron complex has demonstrated potential as a methane mitigation agent with practical applicability in the field, warranting further long-term studies to validate its effectiveness.

Keywords: rice paddy; greenhouse gas; humic acid–iron complex; sustainable agriculture (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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