Abstract. In 1996 conservation tillage was used on nearly 36% of the cropped area of the USA. This level has remained relatively unchanged over the past few years. The use of conservation tillage varied by crop and was dependent on site‐specific factors including soil type, topsoil depth, and local climatic conditions. A number of economic, demographic, geographic, and policy factors have affected the adoption of conservation tillage. While it was not possible to quantify exactly the impact of these factors, it was clear that management complexities and profitability are key factors impeding an increase.
This paper looks at the use of various fossil fuel inputs in the generation of electrical energy via a two step procedure. First, aggregate energy demand is determined and second, corresponding energy fuel shares are examined. This separation suggests that energy is separable and forms a homogeneous aggregate. Finally the question of the stability of the demand for fuel inputs is addressed.
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