Skip to Main Content
Impacts of multiple applications of fertilizer on stream chemistry in the Ouachita MountainsAuthor(s): Hal O. Liechty; Jami Nettles; Stacy Wilson
Source: Gen. Tech. Rep. SRS-92. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 402-406
Publication Series: Miscellaneous Publication
PDF: View PDF (1.1 MB)
DescriptionWe have previously reported changes in stream chemistry following a late winter application of urea and diammonium phosphate to a loblolly pine (Pinus taeda L.) plantation located in a 176-ha subwatershed in the Ouachita Mountains. This stand was again fertilized with 437 kg/ha of urea in March of 2001. Water chemistry prior to, during, and after fertilization was monitored downstream of the stand at the outlet of the subwatershed. Current Best Management Practices prohibit fertilizer entry in streamside management zones (SMZs) by either direct application or aerial drift. Fertilizer traps were located in a SMZ and within unprotected stream channels to document improper entry of fertilizer into the SMZ and quantify rates of applications in the unprotected stream channels. Nitrogen (N) concentrations at the subwatershed outlet increased immediately during application, and a number of the traps within the SMZ collected significant amounts of fertilizer. Application of urea upstream from the SMZ had only minor immediate impacts on stream chemistry. N concentrations increased dramatically during the first storm following fertilization. This increase indicated that the urea, which fell in unprotected stream channels or surrounding upland areas, was washed downstream to the main channel. In May, almost 3 months after application, NO3--N concentrations peaked at 15.4 mg/l during a small storm event. Concentrations of NO3--N remained elevated for at least 2 years after application. Concentrations of NO3--N were also greater than those observed following the first application of fertilizer, suggesting that repeated application of fertilizer could have a cumulative impact on N levels in water draining from intensively managed forests.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
CitationLiechty, Hal O.; Nettles, Jami; Wilson, Stacy. 2006. Impacts of multiple applications of fertilizer on stream chemistry in the Ouachita Mountains. Gen. Tech. Rep. SRS-92. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 402-406
- Stream Chemistry After An Operational Fertilizer Application in the Ouachita Mountains
- Streamside Management Zones Affect Movement of Silvicultural Nitrogen and Phosphorus Fertilizers to Piedmont Streams
- Sediment trapping by streamside management zones of various widths after forest harvest and site preparation
XML: View XML