Effect of fertilizer application on methane emission/production in the paddy soils of Taiwan |
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Authors: | S-S Yang E-H Chang |
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Institution: | (1) Department of Agricultural Chemistry and Global Change Center, National Taiwan University, Taipei, Taiwan 10617, Republic of China Tel.: (2) 3621519; Fax: (2) 3679827, TW |
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Abstract: | Methane production in three types of rice paddy soil was investigated under greenhouse conditions. The amount of methane
produced during the first crop season (March to July) was 2–6 times higher than that in the second crop season (August to
December). Application of organic fertilizer hastened the drop in redox potential and increased methane production and emission.
Methane production also increased with the depth of soil with high values in soil samples from 18 to 30cm depth. Methane production
in the first crop season was 18.0, 54.3 and 49.4mgcm–3 for 6tha–1 straw application for Linkou, Tzawchyau and Jiaushi soils, respectively. The value was 33.4mgcm–3 for the second crop season in Jiaushi soil. Methane emission was high during the flowering and maturity stages in the first
crop season and the values were high during the tillering and flowering stages in the second crop season. Methane emission
was high in Tzawchyau and Jiaushi soils in the first crop season. Methane emission rate reached a maximum from 12 noon to
3p.m. due to high temperature and a minimum at 3 to 6a.m. in both planted and unplanted soils.
Received: 17 September 1996 |
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Keywords: | Methane production Methane emission Paddy soil Redox potential Organic fertilizer |
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