• Kislay Kumari
• A.K.Roy

Actinomycetes with their sporulation, root colonization, bio-control, plant growth promotion and other activities could be potential Agricultural bio-fertilizers. Phosphorus is second most important macronutrients found in bound and immobilized form resulted less solubility and availability to the crops (Azziz et al., 2012, Sharma et. al., 2013). Hence, a phosphate solubilizing actinomycetes Sreptomyces cinnamoneus (AKR-18) was isolated from wheat, maize and paddy fields of Gangatic plain of Bhagalpur district, Bihar, India. Strain AKR-18 was capable to solubilize phosphate from P2O5, AlPO4 and FePO4 in NBRIP media. In the present study, effect of different abiotic factors such as pH, temperature, C-sources, N-sources and incubation period of this strain were standardized. Day wise kinetics of maximum P-solubilization against P2O5 by AKR-18 was 212.15 mg/L. During investigation it was found that lactose was the best C-source (315.20 mg/L) while (NH4)2SO4 was best N-source (275.12 mg/L). The optimum pH and temperature were recorded 7 (286.12 mg/L) and 28˚C±2˚C (291.32 mg/L) respectively. The maximum activity of P-solubilization by AKR-18 was observed after 6 days of incubation (291.52 mg/L). Present study is helpful for future study on this strain (AKR-18). Hence if suitable conditions are available the application of P-solubilizing actinomycetes strain AKR-18 in agricultural field might be enhance the growth and yield of crop plants.

Actinomycetes, Phosphorus, Gangetic plain, Abiotic factors, Sreptomyces cinnamoneus, P-solubilization.

"EFFECT OF DIFFERENT ABIOTIC FACTORS ON PHOSPHATE SOLUBILIZING ACTIVITY BY SPECIFIC ACTINOMYCETES STRAIN ISOLATED FROM GANGATIC PLAIN", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 1, page no.1270-1275, January 2018, Available :http://www.jetir.org/papers/JETIR1801238.pdf

"EFFECT OF DIFFERENT ABIOTIC FACTORS ON PHOSPHATE SOLUBILIZING ACTIVITY BY SPECIFIC ACTINOMYCETES STRAIN ISOLATED FROM GANGATIC PLAIN", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 1, page no. pp1270-1275, January 2018, Available at : http://www.jetir.org/papers/JETIR1801238.pdf