ISSN: 2278-5213









Screening of Salt Tolerant and Growth Promotion Efficacy of Phosphate Solubilizing Bacteria

V. Mohan, K. Saranya Devi, A. Anushya, G. Revathy, G. Viji Kuzhalvaimozhi and K.S. Vijayalakshmi PDF



An attempt was made for screening of salt tolerant against sodium chloride (NaCl) salt and growth promotion
efficacy of eight different phosphate solubilizing bacterial (PSB) isolates under in vitro conditions. An efficient
isolate which exhibited maximum phosphate solubilization, salt tolerant, Indole-3-Acetic Acid (IAA)
production and root colonization potential in maximum concentration of NaCl (7%) was identified as Bacillus
cereus based on 16S rRNA sequencing. It was recorded that highest phosphate solubilization in 7% NaCl
concentration (70% and 374 micro gram/mL) in agar plate and broth assay respectively. IAA production was
observed to be decreased when salt concentration increases, the isolate showed significant amount of IAA in
normal culture media without amendment of NaCl (74.94 micro gram/mL) and at 7% gradual decrease of
IAA production was observed (30 micro gram/mL). Maximum colonization of isolate in the roots of Zea mays was also
observed in the study.
Keywords: Bacillus cereus, salt tolerant, phosphate solubilization, salinity, Zea mays.



Effect of Mix Proportion and Water Cement Ratio on Workability of Concrete

Pranjal Singh, Akash Agrawal, N.N. Harry, Atul and Vikas Srivastava PDF



Concrete is the most popular and multi-applied building material. Properties towards its bright side are easy
making, versatility and compressive strength however; workability plays an important role in use of concrete.
Concrete is said to be workable when it can easily be mixed, placed and compacted homogeneously i.e.
without bleeding or segregation. This study presents the experimental results of workability in terms of slump
for different mix proportions and water cement ratios. Different mix proportions were 1:2:4, 1:1.5:3 and
1:1.25:2.5 and water cement ratios were 0.46 and 0.48. Results showed that slump was increased with
increase of water cement ratio. It was also observed that workability of 1:2:4 mix proportion was more than
that of mix proportion 1:1.5:3 and 1:1.25:2.5 however, workability of 1:1.5:3 mix proportion was slightly more
than the 1:1.25:2.5.
Keywords: Concrete, compressive strength, workability, water cement ratio, mix proportions.













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