1. Acikel U, Erşan M (2010) Acid phosphatase production by Rhizopus delemar: a role played in the Ni(II) bioaccumulation process. J Hazard Mater 184:632–639
2. Ae N, Arihara J, Okada K, Yoshihara T, Johansen C (1990) Phosphorus uptake by pigeonpea and its role in cropping systems of the Indian subcontinent. Science 248:477–480
3. Afzal A, Bano A (2008) Rhizobium and phosphate solubilizing bacteria improve the yield and phosphorus uptake in wheat (Triticum aestivum). Int J Agric Biol 10:85–88
4. Ahmad E (2014) Functional diversity and interactive effect of plant growth promoting rhizobacteria on performance of legumes. Ph.D. thesis, Aligarh Muslim University, Aligarh
5. Ahmad N, Jha KK (1968) Solubilization of rock phosphate by microorganism isolated from Bihar soil. J Can Appl Microbiol 14:89–95