Vol. 7, Special Issue 6 (2019)
Screening of suitable plant growth promoting rhizobacteria in maize based intercropping system
Author(s): A Kumar, A Alam, P Kumar and SK Sharma
Abstract: Under present investigation 48 PGPR isolates were isolated from different rhizotic zones of maize based intercropping system by using different media from twelve different site of Bihar including diara belt. Laboratory and pot experiments were conducted at Deptt. Of Microbiology, F.B.S. & H, RAU, Pusa during Rabi 2008-09, PGPR isolates are coded for Azospirillum spp. as AZS1 to AZS12, Azotobacter spp. as AZT1 to AZT12, Pseudomonas spp. as PSD1 to PSD`12 and P-solubilizing bacteria spp. as PSB1 to PSB12. These isolates were screened on the basis of seed germination, production of IAA, P-solubilization activity, antifungal activity, and nitrogenase activity for the formulation of microbial consortium. Nitrogenase activity (3.15 mole C2H4/g/hr), mycorrhizal infection (80%), MPN of Azospirillum spp. (0.35 x 105/g) and population of P-solubilization bacteria spp. (10.50 x CFU x 105/g) were found maximum in isolates from Hazipur (diara belt) while population of Azotobacter spp. was maximum in Danapur (diara belt). Among the isolates, PSD6 exhibited very high antifungal activity (% inhibition 83.83). Isolate AZT4 showed maximum response against root and shoot length (6.75 and 4.72 cm) and very high response against Nitrogenase activity. Azospirillum spp. isolate AZS6 showed best response against seed germination test and nitrogenase activity (114.48 mole C2H4/mg protein/hr) PSB4 isolate was identified for maximum response against seed germination test and also showed very high P-solubilization activity (75.67%). Keeping in view of experimental findings, PGPRs of diara belt are extremely diversified and perform well in stress condition. They are also competitive in nature and efficient in nitrogen fixing, P-solubilization and producing plant growth hormones. Microbial consortium improves crop growth and increase biomass production. Hence, it may be concluded that PGPRs (PSD6, AZS6 & AZT4 are best microbial Inoculant in all respect than that of others which is very significant not only in growth parameters but also in maintaining soil health for sustainable crop production.
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How to cite this article:
A Kumar, A Alam, P Kumar and SK Sharma. Screening of suitable plant growth promoting rhizobacteria in maize based intercropping system. International Journal of Chemical Studies. 2019; 7(6): 856-865.
