Modified GLEAMS assessment of sludge application on irrigated desert agriculture

Steven J. Wedwick, Peter M. Waller

Research output: Contribution to journalConference articlepeer-review


In response to the need for improved agricultural management practices, the GLEAMS model was modified to include a component that models irrigation practices. This component models furrow, basin, and border irrigation. Other irrigation practices, such as sprinkler or drip, can be modeled if the performance parameters are given. After completing the modifications, a partial validation was performed using soil nitrate data from a municipal sludge experiment performed on a cotton farm in Marana, Arizona. The predicted results from the model (GLEAMS-IR) were within the EPA's recommended factor of 3.0 for each of the sludge treatments evaluated. Sensitivity analyses were performed using a standard, or deterministic, method and a stochastic, Monte Carlo method. The results of the standard sensitivity analysis were distinguished as no sensitivity, low sensitivity, moderate sensitivity, high sensitivity, and very high sensitivity. The Monte Carlo results were ranked by significance (F value.).

Original languageEnglish (US)
JournalPaper - American Society of Agricultural Engineers
StatePublished - 1997
EventProceedings of the 1997 ASAE Annual International Meeting. Part 1 (of 3) - Minneapolis, MN, USA
Duration: Aug 10 1997Aug 14 1997

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)


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