1. Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, 13400–970, Brazil
2. Department of Land, Air and Water Resources, University of California – Davis, Davis, CA 95616, USA
3. Department of Soils and Natural Resources, Santa Catarina State University, Lages, SC 88523-000, Brazil
4. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
5. Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA