Effects of Moisture Content on N<sub>2</sub>O and CH<sub>4</sub> Emission Rate in Early Stage of Dairy Manure Composting

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  • MIYATAKE Fumihito
    Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine
  • KUBOTA Shunya
    Faculty of Animal Husbandry, Obihiro University of Agriculture and Veterinary Medicine
  • TANI Masayuki
    Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine
  • KATO Taku
    Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine
  • IWABUCHI Kazunori
    Faculty of Agriculture, Utsunomiya University
  • MAEDA Takeki
    Faculty of Agriculture, Iwate University
  • MAEDA Kouki
    National Agricultural Research Center for Hokkaido, National Agriculture and Food Research Organization

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Other Title
  • 乳牛ふんの含水率が堆肥化初期過程の一酸化二窒素およびメタンの排出速度に及ぼす影響
  • ニュウギュウ フン ノ ガンスイリツ ガ タイヒカ ショキ カテイ ノ イッサンカ ニチッソ オヨビ メタン ノ ハイシュツ ソクド ニ オヨボス エイキョウ

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In order to clarify the effect of moisture content (about 45 to 85%) on green house gases (GHGs) in the early stage of dairy manure composting, nitrous oxide (N2O) and methane (CH4) emission rate was investigated with a laboratory-scale composting device. Two peaks values of N2O emission rates were observed at the temperature range of 43 to 50℃ and 56 to 68℃ on day 0-1. Their peak values showed the tendency to increase as moisture content decrease. Average emission rate of CH4 was low level (0.009～0.043 mg・h-1・kg-dm-1) at moisture content of about 45 to 74%, though it was high level (8.52 mg・h-1・kg-dm-1) at about 85%. GHGs emission equivalent to carbon dioxide from N2O and CH4 emission decreased at moisture contents of 55.1, 60.8, 65.4, 73.4% compared to the other conditions. Therefore, to control at moisture contents of about 55 to 74% suppress GHGs emission on the early stage of composting.

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