Evaluation of the effects of cassava mill effluent on the microbial populations and physicochemical parameters at different soil depths

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Research Paper 01/12/2012
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Evaluation of the effects of cassava mill effluent on the microbial populations and physicochemical parameters at different soil depths

RN Okechi, CE Ihejirika NA Chiegboka, EI Chukwura, IJ Ibe
Int. J. Biosci.2( 12), 139-145, December 2012.
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The effect of cassava mill effluent on the microbial populations and physicochemical parameters of the soil at various depths was studied. The result revealed the bacterial isolates as Proteus mirabilis, Proteus vulgaris, Bacillus sp, Staphylococcus saprophyticus, and Klebsiella sp, Streptococcus sp, while the fungal isolates were Aspergillus sp, Penicillium sp, Mucor sp and Rhizopus sp. In addition, total aerobic bacterial count results at P<0.05 revealed no statistical difference between surface (4.2×106 ±2.01 cfu/g) and subsurface counts (3.9×106 ±1.46 cfu/g) while both were significantly higher than the deeper sample counts (2.3×106 ±0.76cfu/g). Total fungal results showed significant difference at P<0.05 between surface (4.2×106±2.38 cfu/g) and subsurface (2.1×106±1.36 cfu/g) sample counts, as well as between surface and deeper sample counts (0.2×106±0.44 cfu/g), while no significant difference was observed between subsurface and deeper sample counts at P>0.05. The pH, cyanogenic glycosides, and C/N ratio all increased with depths while %OC, %N, %OM and ECEC decreased with depth. Cassava mill effluent has negatively affected the microbial populations and physicochemical parameters at various depths.


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