Soil sampling guidelines

Last updated on June 26, 2024

Soil testing is an important step in planning nutrient applications to agricultural land for optimizing crop growth, yield, and quality. For accurate soil test results, a composite soil sample must be created by taking samples from several locations that are representative of the entire sampled area. Failure to take a representative sample can lead to an under or over application of nutrients.

There are two main types of soil tests used in British Columbia:

1.  Basic soil fertility test measures the pH and concentrations of phosphorus (P), potassium (K), and other plant nutrients in the upper 15 cm (6 in) of the soil.

2. Post-harvest nitrate test (PHNT) measures the amount of nitrate in the upper 30 cm (12 in) of the soil after crop harvest in the fall (September - November).

While each soil test has its unique applications, the mechanics of taking each soil sample are the same, and in some cases may be taken at the same time.

Find further soil testing information on:

Soil testing information can also be accessed in a printable format (PDF).

Sampling tools
Soil probe

Soil testing starts with good sampling.

Looking for a soil lab?
New soil testing requirements

If agricultural operations with a land base of 2 hectares or more apply nutrient sources to land, post-harvest nitrate and soil test phosphorus results from within the last 3 years should be used to inform nutrient application rates. Details on the new soil testing requirements can be found here.

Contact information

AgriService BC

Have a question?  Call or email and a staff person will assist you.

Telephone: 1 888 221-7141

E-mail: AgriServiceBC@gov.bc.ca