Rates of nitrogen application required to achieve maximum energy efficiency for various crops: results of a long-term experiment

By K. Hülsbergen, B. Feil, Wulf Diepenbrock. 2002

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Effects of nitrogen source and rate on productivity and quality of winter oilseed rape (Brassica napus L.) grown in different crop rotations (2005, background): “However, only a few publications have dealt with the rate of N supply required for the optimum use of energy (e.g. Rathke et al., 1998; Hülsbergen et al., 2002; Rathke et al., 2002).”
Tillage and rotation effect on corn–soybean energy balances in eastern Nebraska (2007, background): “Cropping systems that use commercial fertilizer, especially N, use greater amounts of energy than systems that use no commercial fertilizer (Hülsbergen et al., 2001, 2002; Rathke et al., 2002; Rathke and Diepenbrock, 2006).”