[1]
S. L. Ortega-Achury, G. A. Martínez-Rodríguez, D. Sotomayor-Ramírez, and M. A. Muñoz-Muñoz, “Nutrient concentrations in runoff from different manure amended fields of the tropics under natural rainfall conditions”, JAUPR, vol. 91, no. 3-4, pp. 101–115, Oct. 2007.