The Effects of Ethephon Application on Suppressing Methane Emission and Stimulating Rice Productivity in a Rice Paddy Soil: A Pot Experiment

Abstract

Ethephon is one of the chemical stimulator of crop growth that is also considered as a structural analogue of coenzyme M (CoM), having a promising potential for methanogenic inhibitor. However, the effect of ethephon application on greenhouse gas (GHG) emissions under rice cultivation has not been studied yet. In this pot experiment, different levels of ethephon (0, 2.5, 5 and 10 mg L -1 ) were applied at the presence or absence of manure compost as an organic amendment to study its effect on GHGs emissions in particular CH4 and rice productivity during the cultivation. Application of ethephon effectively suppressed CH4 emissions in particular the initial periods (ca. 3 weeks) right after the application as compared with control soil during rice cultivation, but did not significantly affect N2O emissions. In addition, the maximum CH4 reduction (82% reduction over control) was found at 10 mg L -1 ethephon application right after its addition for 3 weeks during rice cultivation. Rice productivity and yield properties were mainly affected by ethephon application, enhancing ripened grains and number of grains per panicle. Soil properties were not influenced by ethephon application except for available phosphate, which is probably due to enhanced root growth in rhizosphere soils. Conclusively, ethephon could be a new and pioneering amendment for reducing CH4 emission in particular at the initial 3 weeks after the application without increasing other GHG emissions and enhancing rice productivity in paddy soils.

Long-Term Inorganic and Organic Fertilizations Affect CH4 Oxidation Potential and Methanotrophic Community Structure in Paddy Soils

“…크로마토그래피 (GC-2014, Shimadzu, Japan)를 이용하여 정량 분석하였다 (Choi et al, 2020;Lee et al, 2020Lee et al, , 2021. 세균의 정량분석을 위해 qPCR을 실시하였다 (Fig.…”

Does Co-Application of Compost and Mineral Fertilizers Reduce Gaseous Nitrogen (NH3 and N2O) Losses and Improve Nitrogen Use Efficiency from Maize-Growing Soil?

“…재배기간 중 배출되는 총 암모니아의 휘산량은 선행 연구를 참고하여 계산되었다(Yang et al, 2020). 작기 중 아산화질소의 배출량은 기존 연구에서 사용되고 있는 정적 챔버법을 이용하여 평가하였다(Choi et al, 2020;Lee et al, 2020). 가스채취는 각 처리에 3반복으로 headspace 부피 0.0047 m 3 (지름: 17.5 cm, 높이: 19.8 cm)의 원통형 챔버를 설치하여, 주 2회 아산화질소의 배출량이 평균값을 나타 내는 오전 10 -11시 사이에 30분간 진행하였다.…”

Effects of Combined Application of Organic and Inorganic Fertilizers on Mitigating Greenhouse Gas Emissions and Improving Maize Productivity in a Field Condition

“…또한, 유기물의 투입은 토양에서 양이온치환용량 (CEC)을 증가시켜, 작물 재배기간 중 질소 손실을 효과적으로 저감시킬 수 있다 (Liu et al, 2021). (Choi et al, 2020;Lee et al, 2020Lee et al, , 2021a.…”

“…특히, NPK 처리구와 비교하였을 때도 유의한 차이가 없을 정도이 며, 혼용 처리를 통해 무기질 비료에 버금가는 수량을 충분하게 얻을 수 있다는 점에서 시사하는 바가 크다. 따라서 무 기질 비료와 유기퇴비의 혼용 처리는 옥수수 생산성 증진에 긍정적인 효과를 줄 수 있을 것으로 판단된다.질소비료 시비 방법에 따른 옥수수의 단위 수량 당 총 온실가스 잠재능을 평가하기 위해 옥수수 단위수량당 온실가 스배출지수 (GWP per yield)라는 지표를 사용하여 지속가능성에 대한 효과를 비교 분석하였다(Choi et al, 2020;Lee et al, 2020Lee et al, , 2021b. 옥수수 단위 수량당 온실가스 배출지수의 경우 NPK+퇴비에서 가장 낮은 값을 나타냈다.이는 무처리에 비해 38%, 동량 질소 처리한 NPK 처리구에 비해 11% 가량 낮은 값이었다 (Fig.5B).…”