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Energies 2013, 6(3), 1764-1793; doi:10.3390/en6031764
Article

Efficiency of Edible Agriculture in Canada and the U.S. Over the Past Three and Four Decades

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Received: 17 January 2013; in revised form: 7 March 2013 / Accepted: 8 March 2013 / Published: 19 March 2013
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Abstract: We examine technological progress in the US and Canada to answer the question: has the efficiency (e.g., the edible energy efficiency, or EEE) for producing agricultural products in the US and Canada increased in recent decades? Specifically, we determined the energy efficiency of agriculture at the farm gate in recent decades by dividing the outputs (the total annual crop and animal output in energy units minus the feed used for animal production and the grain used for ethanol production) by the energy inputs: all the energy used by the nation to produce food (the energy used to generate and apply the fertilizer, pesticides, seed and to operate machinery) minus the energy inputs to produce grain for ethanol. Our data comes primarily from national and international agricultural censuses. Our study found that the energy efficiency of US agriculture has more than doubled from 0.8:1 in 1970 to 2.2:1 by 2000, then increased more slowly to 2.3:1 by 2009. The energy efficiency of the agricultural sector in Canada has not changed appreciably since 1980, and has varied about a mean of 2:1 from 1981 to 2009. Our study found that EEE improvements in the US could be attributable in part to advancements in crop production per hectare, and lower direct fuel consumption, but also a greater proportion of less energy-intensive corn and changes to the diet of livestock (e.g., increased use of meals and other by-products which have increased the availability of grain). Thus increases due to technological progress alone for the last several decades appear small, less than one percent a year.
Keywords: agriculture; energy; efficiency; United States; Canada; EROI agriculture; energy; efficiency; United States; Canada; EROI
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Hamilton, A.; Balogh, S.B.; Maxwell, A.; Hall, C.A.S. Efficiency of Edible Agriculture in Canada and the U.S. Over the Past Three and Four Decades. Energies 2013, 6, 1764-1793.

AMA Style

Hamilton A, Balogh SB, Maxwell A, Hall CAS. Efficiency of Edible Agriculture in Canada and the U.S. Over the Past Three and Four Decades. Energies. 2013; 6(3):1764-1793.

Chicago/Turabian Style

Hamilton, Abbe; Balogh, Stephen B.; Maxwell, Adrienna; Hall, Charles A.S. 2013. "Efficiency of Edible Agriculture in Canada and the U.S. Over the Past Three and Four Decades." Energies 6, no. 3: 1764-1793.


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