1. Universidade Federal Rural da Amazônia– UFRA, Research of Soil Physics, Institute of Agricultural Sciences, Av. Presidente Tancredo Neves, 2501, Belém, Pará, P.O. Box 66077‐830, Brazil.
2. Escola Superior de Agricultura Luiz de Queiro–ESALQ/USP, Research of Soil Physics, Department of Soil Science, Av. Pádua Dias, 11, Piracicaba, São Paulo, P.O. Box 13418‐900, Brazil.