Phosphorus is one of important macronutrients and plays an important role in metabolism of crop plants. In vertisols the availability of P is limited due to the problem of P fixation. Phosphate solubilizing microorganisms have the capability to solubilize P and make it available for plant uptake. In the present study ability of 16 isolates of Phosphate Solubilizing Bacteria (PSB) to promote growth parameters in greengram crop was tested under greenhouse conditions. The study consisted of 18 treatments which were replicated three times. Inoculation of greengram seeds with PSBV-14 recorded the highest nodule number, nodule dry weight, shoot dry matter and total dry matter in greengram plants 45 days after sowing. Similarly, treatment receiving the inoculation of PSBV-13 recorded the highest root length, root dry matter, P content and P uptake in root and shoot in greengram plants. Majority of PSB isolates tested in the present study were able to improve the growth parameters of greengram significantly compared to rock phosphate control and single super phosphate control. Among the various PSB isolates tested, PSBV-4, PSBV-9, PSBV-12, PSBV-13, PSBV-14 and PSBV-15 fared considerably better than the remaining ones. The highly efficient PSBs from the pot trial could be tested for their efficacy in field conditions before recommending them for commercial exploitation.
A. Vikram and H. Hamzehzarghani, 2008. Effect of Phosphate Solubilizing Bacteria on Nodulation and Growth Parameters of Greengram (Vigna radiata L. Wilczek). Research Journal of Microbiology, 3: 62-72.