Enhancement and inhibition of soil petroleum biodegradation through the use of fertilizer nitrogen

An approach to determining optimum levels

James L Walworth, C. R. Woolard, J. F. Braddock, C. M. Reynolds

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Laboratory studies were conducted to evaluate the relationship between soil water content and microbial response to soil nitrogen (N) in petroleum-contaminated soils. Various levels of N were added to a sand, a sandy loam, and a silt loam. Measurements of the extent of biodegradation in each soil (petroleum loss or CO2 production) indicated that biodegradation was related to soil N expressed as a function of soil water (mg N/kg soil H2O or mg N/l) better than N expressed as a function of soil dry matter (mg N/kg soil). A loamy sand was treated with four levels of N (0, 250, 500, 750 mg N/kg soil) and incubated at three water contents (5.0, 7.5, and 10.0% on a dry soil weight basis). Soil water potential and O2 consumption were best related to N expressed on the basis of soil water. It is concluded that expressing N in units of mg N/kg soil H2O (easily obtained by dividing [mg N/kg dry soil] by [soil moisture content]) can be used to determine fertilization rates for bioremediation processes. On this basis, an optimum N level of approximately 2000 mg N/kg H2O is tentatively identified for the range of soils and conditions tested.

Original languageEnglish (US)
Pages (from-to)465-480
Number of pages16
JournalSoil and Sediment Contamination
Volume6
Issue number5
StatePublished - 1997
Externally publishedYes

Fingerprint

Nitrogen fertilizers
Fertilizers
Petroleum
Biodegradation
biodegradation
petroleum
nitrogen fertilizers
Nitrogen
Soil
Crude oil
fertilizer
Soils
nitrogen
soil
soil water
Water
soil water content
water content
sand
soil water potential

Keywords

  • Bioremediation
  • Nutrient
  • Salinity
  • Water potential

ASJC Scopus subject areas

  • Soil Science

Cite this

Enhancement and inhibition of soil petroleum biodegradation through the use of fertilizer nitrogen : An approach to determining optimum levels. / Walworth, James L; Woolard, C. R.; Braddock, J. F.; Reynolds, C. M.

In: Soil and Sediment Contamination, Vol. 6, No. 5, 1997, p. 465-480.

Research output: Contribution to journalArticle

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