논토양에서 경운방법이 메탄발생과 쌀수량에 미치는 영향

Hyeoun-Suk Cho; Myung-Chul Seo; Tea-Sun Park; Hang-Won Kang

doi:10.7740/kjcs.2015.60.2.167

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Original Research Article

논토양에서 경운방법이 메탄발생과 쌀수량에 미치는 영향 Effect of Tillage Depths on Methane Emission and Rice Yield in Paddy Soil during Rice Cultivation

30 June 2015. pp. 167-173

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Abstract

Green manure crops are organic materials that can supply organic matter and substitute chemical fertilizer, yet emit methane while being decomposed. Therefore, we experimented with different kinds of Green manure crops and tillage depth in order to decrease the amount of methane emitted when utilizing Green manure crops in paddy soil. The amount of methane emitted during the cultivation period of rice started to increase after transplanting and peaked at 63, and 74 days after transplanting, than decreased to almost none starting from 106 days. According to the kind of Green manure crop, it was highest in barley, then hairy vetch and chemical fertilizer. Depending on the tillage depth, the amount of methane emitted decreased by 22.5% in chemical fertilizer, 12.4% in hairy vetch and 11.7% in barley in 20cm tillage compared to 10cm tillage. The air temperature of methane test period was 30~40°C, and the soil temperature was more than about 2~10°C lower than the air temperature. Due to the irrigation started before transplanting, the oxidation-reduction potential (Eh) of soil was rapidly reduced, and showed negative (-) values. Eh values mostly kept the range of –300 ~-500 mV during rice cultivation. It rapidly increased 106 days after transplanting. Rice yield the highest in hairy vetch and did not show differences according to tillage depth. Methane emission could be effectively reduced if the paddy soil was tilled by 20 cm during the application of hairy vetch.

Keywords

green manure crop

methane emission

rice yield

tillage depth

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Information

Publisher :The Korean Society of Crop Science
Publisher(Ko) :한국작물학회
Journal Title :The Korean Journal of Crop Science
Journal Title(Ko) :한국작물학회지
Volume : 60
No :2
Pages :167-173
Received Date : 2014-12-01
Revised Date : 2015-05-18
Accepted Date : 2015-05-19
DOI :https://doi.org/10.7740/kjcs.2015.60.2.167

The Korean Journal of Crop Science ISSN:0252-9777(Print) 2287-8432(Online) 한국작물학회지

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