The effect of Inorganic Fertilizer (IF) on the microbial degradation of diesel
polluted soil in Abeokuta was assessed by collecting Top soil (0 – 15 cm depth) from diesel
polluted site of Information and Communication Centre, Federal University of Agriculture,
Abeokuta, Nigeria. Inorganic fertilizer was added to the polluted soil in the ratio: 0:1 (control),
1:1, 2:1 and 3:1. Microorganism identification, Soil Organic Carbon (SOC) and Total
Petroleum Hydrocarbon (TPH) were determined using standard methods. Data obtained were
subjected to descriptive and inferential statistics. Microorganism identified were
Pseudomonas aeruginosa
,
Proteus vulgaris
,
Enterobacter
sp.,
Bacillus
sp.,
Klebsiella
sp.,
Saccharomyces
sp.,
Candida
sp.,
Fusarium
sp.,
Trichoderma
sp.,
Neurospora
sp.,
Penicillium
sp.,
Alternaria
sp.,
Aspergilus niger
,
Aspergilus flavus
, and
Aspergilus oryzaeas
. pH of the soil ranged
between 5.8 and 7.8. Electrical conductivity, NO
3, Na, Mg and Ca contents decreased with
inorganic fertilizer application. Organic Carbon, PO4 and K increased with fertilizer
application. TPH degradation observed at 1:1, 2:1 and 3:1were 13.38 %, 6.45 % and 10.62 %
respectively.