1. Agarwal N, Singh HP (2002) Antibiotic resistance and inhibitory effect of Azotobacter on soil borne plant pathogens. Indian J Microbiol 42:245–246
2. Ahmad F, Ahmad I, Khan MS (2005) Indole acetic acid production by the indigenous isolated of Azotobacter and fluorescent Pseudomonas in the presence and absence of tryptophan. Tur J Biol 29:29–34
3. Ahmad F, Ahmad I, Khan MS (2008) Screening of free living rhizospheric bacteria for their multiple growth promoting activities. Microbiol Res:173–181
4. Alimi A, Awosola O, Idowu EO (2007) Organic and inorganic fertilizer for vegetable production under tropical conditions. J Agri Rural Develop 1:120–136
5. Al-Khiat Ali EH (2006) Effect of cyanobacteria as a soil conditioner and biofertilizer on growth and some biochemical characteristics of tomato (Lycopersicon esculentum L.) seedlings. Thesis report, King Saud University. Special Publication 6: 1-4