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ARS Home » Southeast Area » Tifton, Georgia » Southeast Watershed Research » Research » Publications at this Location » Publication #149448
Title: FIELD TEST OF THE ROOT ZONE QUALITY MODEL (RZWQM) FOR RUNOFF AND LEACHING OF FENAMIPHOS AND ITS OXIDATION PRODUCTS IN A COASTAL PLAIN FIELD

Author
item Wauchope, Robert - Don
item SCHWARTZ, LILIANA - UNIVERSITY OF GA
item Truman, Clinton

Submitted to: Proceedings of American Chemical Society National Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 6/20/2003
Publication Date: 9/20/2003
Citation: Wauchope, R.D., Schwartz, L., Truman, C.C. 2003. Field test of the root zone quality model (rzwqm) for runoff and leaching of fenamiphos and its oxidation products in a coastal plain field. Proceedings of American Chemical Society National Meeting. Picogram 65, Abs #9(2003), AGRO Division, Am. Chem. Soc. Washington DC.

Interpretive Summary:

Technical Abstract: The USDA-ARS Root Zone Quality Water Model (RZWQM) is a complex one-dimensional field process model for tracking the dynamics of water, pesticides, pesticide metabolites and nutrients in a climate/soil/crop system. We calibrated and validated the RZWQM (Version 3.2) in comparison with a two-year study of pesticide and nutrient fate and transport on a Cowarts loamy sand field (Watershed Z) at the Coastal Plain Experiment Station near Tifton, GA. Sweet corn (Zea Mays L.) and pearl millet (Panicum miliaceum L.) were grown in the spring and summer, respectively. The model¿s accuracy in simulating soil water flows both on the surface and subsurface as well as the runoff and leaching of nutrients, fenamiphos, fenamiphos sulfone and fenamiphos sulfoxide will be demonstrated. Standard practice for row crops in this region utilizes permanent beds and wheel tracks. We found that simulating the hydrology of the beds and wheel tracks separately, and then combining runoff and leaching weighted by area provides insights that a single lumped-parameter simulation obscures. Although fenamiphos is no longer registered we will discuss the implications for potential BMP practices for mitigating the leaching and runoff of other pesticides in this production system.