Fernanda Covacevich1* and Ricardo L. L. Berbara2
1Department of Agronomy, EEA INTA-FCA, UNMP, C.C. 276, Balcarce, Buenos Aires 7620, Argentina.
2Department of Soil, Rural Federal University of Río de Janeiro (UFRRJ), BR 465, km 7, CEP 23890-970 Seropédica, RJ, Brazil.
