A paper about how and why fertilisers are used. This includes also the energy lifecycle of fertilisers and, today even more important, measures which can improve the energy efficiency of fertiliser production and use.
GELLINGS, C.W. ; PARMENTER, K.E. (2004): Energy efficiency in fertiliser production and use. In: Efficient Use and Conservation of Energy, Chapter 3 and Fig.1. Encyclopaedia of Life Support Systems: URL [Accessed: 07.09.2010]