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- NIHEI Takaaki
- Graduate student, Institute of Geoscience, University of Tsukuba
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Graduate student, Institute of Geoscience, University of Tsukuba, Abstract: A large amount of fossil fuel energy is used in modern agriculture. From an ecological aspect, the fossil fuel energy fixed in industrial products such as chemical fertilizers and herbicides makes agriculture inefficient. Agricultural practice needs to be aware of energy efficiency to implement low input management and to reduce the environmental impact. This study demonstrates a method of calculating the input-output energy ratio for 32 crops and examines the changes in the energy efficiency of crop production in Japan from 1970 to 1990. The results at the country level show that the input-output energy ratio changed from 2.0 to 1.2 in the two decades. The primary reason for this decline is due to the increase in the planted area of greenhouse vegetables, whose input-output energy ratio is 0.02-0.07. The secondary reason for this decline is due to the decrease in the planted area of paddy rices, whose input-output energy ratio is 2.5-3.1. The results at the prefecture level show that the input-output energy ratio declines especially in Kochi, Kumamoto and Okinawa prefecture, whose percentages of planted area of greenhouse vegetables are more than three times larger than the average for all the prefectures. The results presented also imply that agriculture in Japan has increased its impact on the natural environment through an increased use of fossil fuel energy.
収録刊行物
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- Ｇｅｏｇｒａｐｈｉｃａｌ ｒｅｖｉｅｗ ｏｆ Ｊａｐａｎ， Ｓｅｒｉｅｓ Ｂ
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Ｇｅｏｇｒａｐｈｉｃａｌ ｒｅｖｉｅｗ ｏｆ Ｊａｐａｎ， Ｓｅｒｉｅｓ Ｂ 73 (1), 27-45, 2000
公益社団法人 日本地理学会
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詳細情報 詳細情報について
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- CRID
- 1390001204326628096
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- NII論文ID
- 10004952607
- 10006852505
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- NII書誌ID
- AA10518430
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- ISSN
- 21851700
- 02896001
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
