Enhancement and inhibition of soil petroleum biodegradation through the use of fertilizer nitrogen: An approach to determining optimum levels

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

Research output: Contribution to journalArticle

56 Scopus citations

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
DOIs
StatePublished - Jan 1 1997
Externally publishedYes

Keywords

  • Bioremediation
  • Nutrient
  • Salinity
  • Water potential

ASJC Scopus subject areas

  • Environmental Chemistry
  • Soil Science
  • Pollution
  • Health, Toxicology and Mutagenesis

Fingerprint Dive into the research topics of 'Enhancement and inhibition of soil petroleum biodegradation through the use of fertilizer nitrogen: An approach to determining optimum levels'. Together they form a unique fingerprint.

Cite this