1. Ball, E M 1990 Agar double diffusion plates. In Serological Methods for Detection and Identification of Viral and Bacterial Plant Pathogens. Eds. H, Hampton and E, Ball. pp 11?120. The American Phytopathological Society, St. Paul, MN, USA.
2. Bremmer, J M and Mulvaney, C S 1982 Nitrogen-total. Agronomy 9, 595?624.
3. Dreyfus, B and Dommergues, Y 1981a Nodulation of Acacia species by fast and slow growing tropical strains of Rhizobium. Appl. Environ. Microbiol. 41, 97?99.
4. Dreyfus, B and Dommergues, Y 1981b Relationship between rhizobia of Leucaena and Acacia sp. Leucaena Res. Rep. 2, 43?44.
5. Galiana, A, Prin, Y, Mallet, B, Gnahoua, G M, Poitel, M and Diem, H G 1994 Inoculation of Acacia mangium with alginate bead containing selected Bradyrhizobium strains under field conditions: Long term effect on plant growth and persistence of the introduced strains in soil. Appl. Environ. Microbiol. 60, 3974?3980.