Fort Hays State University > About FHSU > Academic Divisions > College of Health and Life Sciences > Department of Agriculture > University Farm > Soil Sampling And Analysis
In the past, farmers estimated the conditions of an entire field by averaging the results from analysis of
soil samples randomly gathered around the acreage. Then the entire field was treated based on the average
analysis. This approach of treating a whole field on the average made fertilizer recommendations and applications
very simple. Only one rate of fertilizer was applied. With new precision farming technologies that allow changing
fertilizer rates on-the-go, fertilizer is only applied as needed at each spot in the field. This change in
application methods has shifted the goal of soil sampling from measuring the whole field average to measuring
the variability of soil properties throughout the field. The two most common methods that accomplish this are
through grid sampling and soil type sampling.
Grid sampling involves dividing a field into square or rectangular sections of several acres or less in size.
The grower gathers soil samples from each section and sends them to a laboratory for analysis. The objective is
to better estimate the need for soil nutrients on a scale smaller than the entire field.
Soil type sampling involves sampling sections of the field that have similar soil types. A grower uses soil
survey maps to select sampling locations. Several samples are combined from each area of different soil type.
This method results in samples being taken from different spacings around the field.