Record Display for the EPA National Library Catalog


Main Title Effect of Chemicals on Soil Nitrifying Populations Using a Continuous-Flow Culture Technique.
Author Hendricks, C. W. ; Rhodes, A. N. ;
CORP Author Corvallis Environmental Research Lab., OR.
Publisher 1989
Year Published 1989
Report Number EPA/600/D-89/221;
Stock Number PB90-134289
Additional Subjects Soil microbiology ; Nitrification ; Nitrogen fixing bacteria ; Organic compounds ; Herbicides ; Concentration(Composition) ; Toxicity ; Metabolism ; Nitrosomonas ; Cells(Biology) ; Roundup ; Glyphosate
Library Call Number Additional Info Location Last
NTIS  PB90-134289 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14p
The study examines the effects of Roundup (N-(phosphonomethyl)glycine) and N-Serve(2-chloro-6-(trichloromethyl)pyridine) on nitrifying organisms in static batch, perfusion soil columns, and a new continuous-flow soil column system. The continuous-flow method is new to nitrification studies and was shown to produce greater nitrifier activity than either static batch or perfusion techniques. Both products were shown to significantly inhibit nitrification in treated soils over untreated controls. N-Serve completely inhibited nitrification at concentrations less than 42 ug nitrapyrin/g dry soil, and Roundup significantly reduced nitrification at 6.8 and 68 mg glyphosate/g dry soil. Heterotrophic bacterial populations increased significantly in continuous-flow columns treated with 42 mg nitrapyrin and 68 mg glyphosate/g dry soil.