1. Anonymous. (2005). Agenda 21 de la provincia de Jaen, Desarrollo Socioeconómico Agricultura. http://www.agenda21jaen.com/export/sites/default/galerias/galeriaDescargas/agenda21/Aplicaciones/documentacion/Diagnosis-provincial/23._Turismo.pdf. Accessed 24 Feb 2019.
2. Anuario Estadístico de Andalucía. (2015). Statistics on crop production, land use and fertilizer sales provided by Junta de Andalucía (Andalusian Regional Government). https://www.juntadeandalucia.es/institutodeestadisticaycartografia/badea/informe/anual?CodOper=b3_6&idNode=6049. Accessed 24 Sept 2019.
3. Arregui, L. M., & Quemada, M. (2006). Drainage and nitrate leaching in a crop rotation under different N strategies: application of capacitance probes. Plant and Soil,288, 57–69.
4. Arregui, L. M., & Quemada, M. (2008). Strategies to improve nitrogen-use efficiency in winter cereal crops under rainfed Mediterranean conditions. Agronomy Journal,100, 277–284.
5. Bolan, N. S., & Hedley, M. J. (2003). The role of carbon, nitrogen and sulphur in soil acidification. In Z. Rengel (Ed.), Hand book of soil acidification. New York: Marcel and Dekker.