Deb Jaisi


Current Courses

  • PLSC445/645: Biogeochemical cycling of nutrients (offered in every other Spring semester: 2012, 2014, 2016)
  • PLSC467: Environmental Forensics and Society (offered in each Spring semester 2016, 2017, 2018)


Disciplinary roots of the research activities conducted in my research team consist of studying the biogeochemical cycle specific to phosphorus in soils, sediments, and waters. Its applications are interdisciplinary and span in three fronts: phosphorus as i) an essential element for all living beings (a nutrient), ii) as a major environmental contaminant (a pollutant), and iii) a biocidal agent (e.g., a herbicide). Our research is carried over a trillion-fold scale range, from chemical bond formation/cleavage to micro-macro scale processes in soil and sediment and to landscape and ecosystem processes. The ecosystem scale research seeks to address questions on source, sink, transformation, and internal cycling of phosphorus in terrestrial and coastal environments.

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Professional Activities

  • Member, Sigma Xi Society
  • Member, American Geophysical Union (AGU)
  • Member, Geological Society of America (GSA)
  • Member, Soil Science Society of America (SSSA)


  • Li, H., Joshi, S.R. and Jaisi, D.P. Degradation and isotope source tracking of glyphosate and aminomethylphosphonic acid (AMPA). Journal of Agricultural and Food Chemistry, 64, 529−538.
  • Joshi, S.R., Li, X.L. and Jaisi, D.P. Transformation of phosphorus pools in an agricultural soil: An application of 18O labeling of phosphate. Soil Science Society of America Journal, 80, 69–78.
  • Joshi, S.R., Kukkadapu, R.K., Burdige, D., Bowden, M., Sparks, D.L. and Jaisi, D.P. (2015). Organic matter remineralization predominates phosphorus cycling in the mid-bay sediments in the Chesapeake Bay. Environmental Science & Technology, 49, 5887−5896.
  • Stout, L.M., Joshi, S.R., Kana, T., Jaisi, D.P. (2014). Microbial activities and phosphorus cycling: an application of oxygen isotope ratios in phosphate. Geochimica et Cosmochima Acta, 138, 101−116.
  • Jaisi, D.P., Blake, R.E., Liang, Y., and Chang, S-J. (2014). Investigation of compound-specific organic-inorganic phosphorus transformation using stable isotope ratios in phosphate. In Applied Manure and Nutrient Chemistry for Sustainable Agriculture and Environment (Eds. Z. He and H. Zhang). 267−292pp.
  • Jaisi, D.P. Blake, R.E. (2014) Advances in using oxygen isotope ratios of phosphate to understand phosphorus cycling in the environment. Advances in Agronomy, 125, 1−54.


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Contact Information
Deb Jaisi

Associate Professor

Plant and Soil Sciences
160 Townsend Hall

Newark, DE 19716
Phone: (302) 831-1376
Fax number: (301) 831-0605