African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6574

Full Length Research Paper

Assessment of the impact of kerosene and diesel on soil nitrogen mineralisation

Orji, J. C.1*, Uzoho, B.2, Enwerem, J. O.1 and Ezurike, W. 1
1Department of Microbiology, Federal University of Technology, P.M.B.1526, Owerri, Imo State, Nigeria. 2Department of Soil Science, Federal University of Technology, P.M.B.1526, Owerri, Imo State, Nigeria.
Email: [email protected]

  •  Published: 04 June 2011

Abstract

Effects of different concentrations (1, 2 and 5% v/w) of diesel and kerosene on N mineralization were studied in a sandy loam soil. Relative to the untreated soil, higher ammonium-N levels were obtained in samples treated with all the concentrations of kerosene and diesel from the second and third weeks of incubation respectively while extents of nitrate-N production differed. Net N-mineralization was 17.211 mg mineral-N/kg soil in untreated soil and -11.753 mg mineral-N/kg soil and -26.562 mg mineral-N/kg soil respectively in soils treated with 5% kerosene and diesel after six weeks incubation. Net nitrification was 29.90 mg NO3-N/kg soil in untreated soil and -9.35 mg NO3-N/kg soil and -22. NO3-N/kg soil respectively in soils treated with 5% kerosene and diesel after six weeks incubation. Overall mineralization rates were highest (13.01 mg N/kg soil per week) in untreated soil. Rates were lower in diesel than in kerosene treated soils. Inhibition of net N mineralisation ranged from of 139.31 to 168.29% and 90.41 to 254.34% after sixth week incubation for kerosene and diesel-treated soils respectively. The toxicity of diesel and kerosene treatment on nitrogen mineralization in the soil is due more to their effects on ammonium-N than on nitrate-N production.

 

Key words: Mineralisation, nitrification, ammonium, nitrate, diesel and kerosene.