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By B A Stout

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Energy thrift in p a c k a g i n g and marketing. Technol. Rev, 76: 32-43. Boustead, I. , 1979. Handbook of Industrial E n e r g y Analysis. Horwood, Chiches­ ter, Great Britain, 422 pp. , 1980. Fuel and energy efficiency. In: D. Pimentel (Editor), Handbook of Energy Utiliza­ tion in Agriculture. CRC Press, B o c a Raton, FL, pp. 15-21. , 1974. The history of the h u m a n population. Sci. , 231: 4 0 - 5 1 . , III, 1980. A c c o u n t i n g for energy in farm machinery and buildings. In: D. Pimentel (Editor), Handbook of E n e r g y U t i l i z a t i o n in Agriculture.

Thus, as expected, as the yields increased the intensity of management of the ecosystem also increased along with controls of the environment. This greater intensity in management increased the amount of energy that has had to be invested in food production (Pimentel and Pimentel, 1979). Chapter 2 references, p. 28. 14 Energy inputs in production agriculture In this chapter, I will examine energy use in production agriculture; this will include assessing the inputs of solar and fossil energy in producing crops and livestock for food.

2). 2). 3 MJ. 3). A medium to large tractor or combine on the farm will consume 20-40 L/h; for comparison, a compact automobile will burn about 10 L/h. In addition to tractors and combines on farms, the next most important consumer of liquid fuel is irrigation equipment. 075 for p r o d u c t i o n a n d h a r v e s t i n g . 134 3 I n v e r s e e n e r g y efficiency = t h e t o t a l u n i t s of primary e n e r g y required to deliver 1 u n i t of e n e r g y of v a r i o u s t y p e s to final demand.

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