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This study was carried out to evaluate the biostimulant potentials of  Capra aegagrus hircus  manure for bioremediation of crude oil contaminated soil (COCS) under tropical conditions. 1 kg of COCS sample was amended with 0.02 kg of  C. a. hircus  manure and monitored at 14-day intervals for total petroleum hydrocarbon (TPH), nutrient content, and changes in microbial counts. At the end of the study period, there was 62.08% decrease in the concentration of TPH in the amended sample compared to 8.15% decrease in the unamended sample, with significant differences ( P  < 0.05) in TPH concentrations for both samples at different time intervals. Similarly, there was a gradual decrease in the concentrations of total organic carbon, nitrogen, phosphorus, and potassium in both samples. The culturable hydrocarbon-utilizing bacteria (CHUB) increased steadily from 8.5 × 10 5  cfu/g to 2.70 × 10 6  cfu/g and from 8.0 × 10 5  cfu/g to 1.78 × 10 6  cfu/g for both samples.  Acinetobacter ,  Achromobacter ,  Bacillus ,  Flavobacterium ,  Klebsiella ,  Micrococcus ,  Pseudomonas , and  Staphylococcus  were isolated from amended sample with  Pseudomonas  being the predominant isolated bacterial genus. This study demonstrated that  C. a. hircus  manure is a good biostimulant, which enhanced the activities of indigenous hydrocarbonoclastic bacteria resulting in significant decrease in TPH concentration of COCS.

Enhanced Bioremediation of Soil Artificially Contaminated with Petroleum Hydrocarbons after Amendment with Capra aegagrus hircus (Goat) Manure