1. Amara MAT, Dahdoh MSA (1997) Effect of inoculation with plant growth-promoting rhizobacteria (PGPR) on yield and uptake of nutrients by wheat grown on sandy soil. Egypt J Soil 37:467–484
2. Asghar HN, Zahir ZA, Arshad M, Khalig A (2002) Plant growth regulating substances in the rhizozphere: microbial production and functions. Adv Agron 62:146–151
3. Bashan Y (1998) Inoculants of plant growth-promoting bacteria for use in agriculture. Biotechnol Adv 16:729–770
4. Bin L, Smith DL, Ping-Qui F (2000) Application and mechanism of silicate bacteria in agriculture and industry. Guizhou Sci 18:43–53
5. Biswas JC, Ladha JK, Dazzo FB (2000) Rhizobial inoculation influences seedling vigor and yield of rice. Agron J 92:880–886