What are the dimensions of the grid cell used in the common grid sampling approach?

• A. 360 feet by 360 feet.
• B. 120 feet by 120 feet.
• C. 500 feet by 500 feet.
• D. 60 feet by 60 feet.

Answer: (A)

In grid sampling, the field is divided into uniform cells so each cell’s soil characteristics can be represented by one sample. The size of each grid cell affects both how accurately you can map variability and how much work it takes to collect samples. The commonly used grid cell dimensions are 360 feet by 360 feet. That creates cells about 129,600 square feet in area, or roughly 3 acres per cell. This size provides a practical balance: enough sampling resolution to detect meaningful differences in soil fertility across a field, while keeping the number of samples and analysis costs manageable. Smaller cells would require many more samples and higher costs, while larger cells would smooth over variability and reduce the usefulness of the results for site-specific management.