Efflux of Soil Nitrous Oxide from Applied Fertilizer Containing Organic Materials in Citrus unshiu Field in Southwestern Japan

Yo Toma, Takeshi Higuchi, Osamu Nagata, Yasuhiko Kato, Tooru Izumiya, Shingo Oomori and Hideto Ueno
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Yo Toma: Graduate School of Agriculture, Ehime University, 3-5-7, Tarumi, Matsuyama, Ehime 790-8566, Japan
Takeshi Higuchi: Graduate School of Agriculture, Ehime University, 3-5-7, Tarumi, Matsuyama, Ehime 790-8566, Japan
Osamu Nagata: Agriculture, Forestry and Fisheries Research Council, Ministry of Agriculture, Forestry and Fisheries, JAPAN, 1-2-1, Kasumigaseki, Chiyoda-ku, Tokyo 100-8950, Japan
Yasuhiko Kato: Nippon Steel & Sumikin Engineering, 1-5-1, Oosaki, Shinagawa, Tokyo 141-8604, Japan
Tooru Izumiya: Nippon Steel & Sumikin Engineering, 1-5-1, Oosaki, Shinagawa, Tokyo 141-8604, Japan
Shingo Oomori: Graduate School of Agriculture, Ehime University, 3-5-7, Tarumi, Matsuyama, Ehime 790-8566, Japan
Hideto Ueno: Graduate School of Agriculture, Ehime University, 3-5-7, Tarumi, Matsuyama, Ehime 790-8566, Japan

Agriculture, 2017, vol. 7, issue 2, 1-11

Abstract: Nitrous oxide (N 2 O) emissions from agricultural fields are an important source of the increasing atmospheric N 2 O concentration. We conducted a two-year investigation of soil N 2 O emissions induced by the application of combined organic and synthetic fertilizer (COS) and distilled silage waste (DSW). Three experimental treatments were applied to a Citrus unshiu field in January 2013 in Ehime, Japan: no fertilizer (NF), COS, and DSW. The applied nitrogen (N) from DSW was 192 and 244 kg N ha −1 in the first and second years, respectively, although the N application in COS was 192 kg N ha −1 in both years. The main N forms in COS and DSW were ammonium- and nitrate-N, respectively. Soil N 2 O and carbon dioxide fluxes, soil chemical properties, and mineral N leaching from topsoil were measured. The soil N 2 O flux increased after fertilization in COS and DSW, and a higher N 2 O efflux after supplemental fertilization was induced by warm and wet soil conditions. The emission factor of N 2 O was higher in COS (2.02%) than in DSW (1.18%), while N leaching was higher in DSW than in COS. The organic materials remaining after the application possibly increased the N 2 O emissions in the summer season. Therefore, to mitigate N 2 O emissions in citrus orchards, fertilizer containing organic materials should be applied during a cool and dry season.

Keywords: emission factor; citrus orchard; combined organic and synthetic fertilizer; distilled silage waste (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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