Affiliation: | 1.Department of Soil Science, Federal Rural University of Rio de Janeiro, BR 465, Km 07, Seropédica, RJ, 23897-000, Brazil ;2.University of S?o Paulo, “Luiz de Queiroz” College of Agriculture, Av. Pádua Dias 11, Piracicaba, SP, 13418-900, Brazil ; |