RT Journal Article
SR Electronic
T1 Predicting spatial distributions of nitrate leaching in northeastern Colorado
JF Journal of Soil and Water Conservation
FD Soil and Water Conservation Society
SP 288
OP 293
VO 49
IS 3
A1 B.K. Wylie
A1 M.J. Shaffer
A1 M.K. Brodahl
A1 D. Dubois
A1 D.G. Wagner
YR 1994
UL http://www.jswconline.org/content/49/3/288.abstract
AB Identification of regional problem areas for NO3-N leached from agriculture is important to farmers, extension, and action agencies to develop efficient management control strategies. A Nitrate Leaching and Economic Analysis Package (NLEAP) model/Geographic Information System (GIS) combination was tested for regional irrigated agriculture in eastern Colorado. Results indicated that the NLEAP NO3-N -leached (NL) index, an index of the amount of NO3-N leached below the rooting zone, was useful for describing the distribution of groundwater NO3-N concentrations across a 736 km2 (248 mi2) area when used in combination with a GIS. Comparison of observed NO3-N distributions in the South Platte alluvial aquifer with simulated NL distributions gave regional Pearson correlation coefficients of 0.59 and showed that the model could simulate the major observed groundwater NO3-N patterns.