@book{226963,
	author = {Sims, J. Thomas and Sharpley, Andrew},
	title = {Phosphorus: agriculture and the environment = Fósforo: Agricultura y Medio Ambiente / J. T. Sims; A. N. Sharpley},
	publisher = {American Society of Agronomy},
	year = {2005},
	address = {Madison}
}