@article {Wylie288, author = {B.K. Wylie and M.J. Shaffer and M.K. Brodahl and D. Dubois and D.G. Wagner}, title = {Predicting spatial distributions of nitrate leaching in northeastern Colorado}, volume = {49}, number = {3}, pages = {288--293}, year = {1994}, publisher = {Soil and Water Conservation Society}, abstract = {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.}, issn = {0022-4561}, URL = {https://www.jswconline.org/content/49/3/288}, eprint = {https://www.jswconline.org/content/49/3/288.full.pdf}, journal = {Journal of Soil and Water Conservation} }