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Sustainability 2018, 10(1), 120; https://doi.org/10.3390/su10010120

Energy Efficiency of Intensive Rice Production in Japan: An Application of Data Envelopment Analysis

Department of Biological Resources Management, School of Environmental Science, The University of Shiga Prefecture, 2500 Hassaka-cho, Hikone, Shiga 522-8533, Japan
Received: 23 October 2017 / Revised: 5 December 2017 / Accepted: 3 January 2018 / Published: 6 January 2018
(This article belongs to the Special Issue Food-Energy-Water Nexus: Towards New Thinking and Action)
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Abstract

Intensive rice production has contributed to feeding the world’s growing world population, but it has also increased fossil energy consumption. This paper examines the effect of increasing the scale of rice farming on the energy efficiency of intensive rice production in Japan. A data envelopment analysis (DEA) approach is used to calculate energy efficiency scores and identify operational targets. A window analysis technique is applied to the 2005–2011 statistical data, with nine scales of rice farming, ranging from <0.5 ha to ≥15 ha. Six energy inputs (fossil fuels, electricity, chemical fertilizers, pesticides, agricultural services, and agricultural machinery) and the weight-based rice yield are selected as the DEA inputs and the DEA output, respectively. The results show that the energy efficiency scores range from 0.732 for farms of 1 ha to <2 ha, to 0.988 for farms ≥15 ha. Overall, increasing the scale of rice farming in Japan improves energy efficiency because of a great reduction in the energy consumed per unit area by agricultural machinery and agricultural services. These findings suggest that increasing the scale of farming is an effective way to enhance the energy efficiency of highly mechanized rice production in developed countries, such as Japan. View Full-Text
Keywords: energy efficiency; data envelopment analysis; window analysis; intensive farming; rice; Japan energy efficiency; data envelopment analysis; window analysis; intensive farming; rice; Japan
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Masuda, K. Energy Efficiency of Intensive Rice Production in Japan: An Application of Data Envelopment Analysis. Sustainability 2018, 10, 120.

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