[1] Fernandez-Escobar, R., Garcia-Novelo, J.M., Restrepo-Diaz, H. (2011) Mobilization of nitrogen in the olive bearing shoots after foliar application of urea. Scientia Horticulturae 127, 452-454.
[2] Sanchez, E.E., Khemira, H., Sugar, D., Righetti, T.L. (1995) Nitrogen management in orchards. In: Bacon, P.E. Ed., Nitrogen Fertilization in the Environment. Marcel Dekker, Inc., New York, 327–380.
[3] Giménez, C., Díaz, E., Rosado, F., García-Ferrer, A., Sánchez, M., Parra, M.A., Díaz, M., Pe?a, P. (2001) Characterization of current management practices with high risk of nitrate contamination in agricultural areas of southern Spain. Acta Horticulturae 563, 73–80.
[4] Marschner, H. (1995) Mineral Nutrition of Higher Plants. Academic Press Limited, London.
[5] Li, H., Liang X., Chen Y., Lian Y., Tian G., Ni W. (2008) Effect of nitrification inhibitor DMPP on nitrogen leaching, nitrifiying organism, and enzyme activities in a rice-oilseed rape system. Journal of environment Sciences. 20, 149-155. doi:10.1016/S1001-0742(08)60023-6.