Andre Dotto, USP University of Sao Paulo, Soil, Piracicaba, Brazil, Jose alexandre Dematte Sr, University of Sao Paulo, Sao Paulo, Brazil, Raphael Armando Viscarra Rossel, CSIRO Canberra, Canberra, ACT, Australia and Rodnei Rizzo, CENA Center for Nuclear Energy in Agriculture, Piracicaba, Brazil