Tracking Soil Nitrogen Fertility across Minnesota.
Jared A. Spackman, Department of Soil, Water, and Climate, University of Idaho, Aberdeen, ID, US, Fabian G. Fernandez, Department of Soil, Water, and Climate, University of Minnesota-Twin Cities, St. Paul, MN, Jeffrey A. Coulter, Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN and Daniel E. Kaiser, Department of Soil, Water, and Climate, University of Minnesota-Twin Cities, St Paul, MN, US