Application of GIS to integrated pest management on U.S. Fish and Wildlife Service land / Nitrogen management in sugar beet using remote sensing and GIS / Using historical management to reduce soil sampling errors / Developing productivity zones from multiple years of yield monitor data / Site-specific weed management in growers' fields : predictions from hand-drawn maps / Map quality assessment for site-specific fertility management / Gleaning more information from yield data / Soil salinity mapping using ArcGIS / Using GIS and on-the-go soil strength sensing technology for variable-depth tillage assessment / Collocating multiple self-generated data layers