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Comparison of the Pesticide Root Zone Model Simulated and Measured Pesticide Mobility under Two Tillage Systems
Author(s) -
Sauer T. J.,
Fermanich K. J.,
Daniel T. C.
Publication year - 1990
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1990.00472425001900040016x
Subject(s) - carbofuran , dns root zone , pesticide , tillage , chlorpyrifos , leaching (pedology) , environmental science , metolachlor , irrigation , atrazine , plough , penetration (warfare) , chemistry , environmental chemistry , hydrology (agriculture) , soil science , agronomy , soil water , mathematics , geology , biology , operations research , geotechnical engineering
The USEPA's Pesticide Root Zone Model (PRZM) was evaluated to determine its ability to predict pesticide movement in the unsaturated zone of a Plainfield sand (Typic Udipsamments) profile under no‐till (NT) and moldboard plow (MB) tillage practices. Atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐ s ‐triazine) and metolachlor [2‐chloro‐ N ‐(2‐ethyl‐6‐methylphenyl)‐ N ‐(2‐methoxy‐1‐methylethyl) acetamide] distribution in the root zone was measured by analysis of soil cores taken from nonirrigated field plots. The mobility of carbofuran (2,3‐dihydro‐2,‐dimethyl‐7‐benzofuranyl methylcarbamate) and chlorpyrifos [ O,O ‐diethyl‐ O ‐(3,5,6‐trichloro‐2‐pyridyl) phosphorothioate] was measured using intact soil columns extracted from adjacent field plots and subjected to a typical irrigation schedule. Predicted depth of pesticide penetration, depth to peak concentration, and amount of pesticide leached from the root zone were compared with measured pesticide distributions and leaching patterns. Acceptable agreement between PRZM simulations and measured data was obtained early in the growing season whereas the model generally predicted greater‐than measured pesticide penetration at later sampling dates.