An Alternative Approach to Site Selection and Frequency for Global Positioning System Soil Mapping

Abstract

A 2.5 acre research plot was utilized in an instructional project to evaluate alternative
approaches to Global Positioning System (GPS) soil mapping. Based on detailed soil
sampling data, a extensive record of cultural practices, and historical records of
topographic and drainage alterations, the acreage was evaluated by a variety of methods,
including grid and soil type sampling. Students visually inspected the property and were
given four topographic maps that depict the land in different stages during 30 years of
agricultural production. Information was provided concerning organic matter
applications, crop production and yield results. Students proposed a sampling procedure
and were provided results based on data previously collected. From this information,
students recommended inputs and alterations to production procedures. The complete set
of 1200 soil samples was utilized to determine the effectiveness of sampling procedures
proposed by students.