1. Center for Nuclear Energy in Agriculture, University of Sao Paulo, Piracicaba, Brazil
2. Department of Terrestrial Ecology, Netherlands Institute of Ecology, Wageningen, the Netherlands
3. Department of Microbial Ecology, Netherlands Institute of Ecology, Wageningen, the Netherlands
4. Western Amazon Agroforestry Research Center, Brazilian Agricultural Research Corporation, Manaus, Brazil
5. General Coordination of Research, Training, and Extension, National Institute of Amazonian Research, Manaus, Brazil
6. Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida, USA