“Nitrate leaching from a Latosol after application of liquid swine manures in different pH values and organic matter contents - doi: 10.4025/actasciagron.v32i4.10070”, Acta Sci. Agron., vol. 32, nº 4, p. 743–748, nov. 2010, doi: 10.4025/actasciagron.v32i4.10070.