National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The bio-recovery of three different oil-polluted tropical soils – RS (oil-polluted soil sample from River state), LS (soil sample from NNPC depot, Lagos) and POS (oil-polluted soil sample from Oriade L.G.A., Lagos) by manure amendment was studied for eight weeks. The rates of crude oil biodegradation after manure application as quantified by Gas chromatographic analysis of residual total petroleum hydrocarbon (TPH) showed the same trend of decrease in the total petroleum hydrocarbons in both the LS and RS series. The TPH for the LSC (non-oil polluted LS soil sample as Control) series at weeks 4 and 8 were 1893.42 ± 26.16 mg/kg and 1080.86 ± 14.33mg/kg, this was significantly different from that of LSpg (pig manure-amended soil) which for the same weeks which were 1107.19 ± 18.41, 258.56±4.16 mg/kg TPH respectively and from that of LSgt (goat manure-amended soil sample) which were 1355.15 ± 7.45, 491.24 ± 20.82 mg/kg TPH respectively. The results show that pig manure was a better organic amendment than goat manure in the LS series soil but at the long run not better than goat manure in the RS and POS soils. Microbiological counts showed a peak at week 6 with HUF (hydrocarbon - utilizing fungi) (34 × 103cfu/g) for LSC; a peak at week 2 with HUB (hydrocarbon-utilizing bacteria) (252 × 105cfu/g) for LSpg and a peak at week 6 for LSgt with HUB (91× 105cfu/g).Also, microbial counts revealed a peak in week 2 with HUB (206 × 105cfu/g) for POSC; a peak at week 8 for POSpg (oil polluted + pig manure amended Oriade soil sample) with HUB (197× 105cfu/g) and a peak at week 8 for POSgt with HUB (138 × 105cfu/g). Microbial counts also revealed peaks at week 4 (97 × 105 cfu/g), 64 × 105 cfu/g and 119 ×105 cfu/g for RSC (River state control soil sample), RSpg and RSgt samples respectively all with HUB. In terms of soil properties, in RS soils, pig manure added more ammonium, total organic matter, nitrate, phosphorus and potassium than goat manure; in POS soils, pig manure lowered pH, NH4+,Phosphorus more than goat manure; in LS soils, goat manure added more total organic matter, sodium and potassium while pig manure added more NH4+, nitrate and phosphorus.
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