1. Editorial

   • Pierre C. Robert

   OriginalPaper Pages: 247 - 247

2. Empirical Modeling of Relationships Between Sorghum Yield and Soil Properties

   • T. M. Shatar
   • A. B. Mcbratney

   OriginalPaper Pages: 249 - 276

3. Precision Farming Protocols: Part 1. Grid Distance and Soil Nutrient Impact on the Reproducibility of Spatial Variability Measurements

   • Jiyul Chang
   • David E. Clay
   • Mike Ellsbury

   OriginalPaper Pages: 277 - 289

4. Relationship Between Spectral Data from an Aerial Image and Soil Organic Matter and Phosphorus Levels

   • Gary E. Varvel
   • Michael R. Schlemmer
   • James S. Schepers

   OriginalPaper Pages: 291 - 300

5. A Load Cell Based Yield Monitor for Peanut Feasibility Study

   • J. S. Durrence
   • T. K. Hamrita
   • G. Vellidis

   OriginalPaper Pages: 301 - 317

6. Spatial Variability of Agricultural Soil Fertility Parameters in a Gleyic Podzol of Belgium

   • M. Geypens
   • L. Vanongeval
   • J. Meykens

   OriginalPaper Pages: 319 - 326

7. Method for Precision Nitrogen Management in Spring Wheat: I Fundamental Relationships

   • Richard E. Engel
   • Dan S. Long
   • Corey Meirer

   OriginalPaper Pages: 327 - 338