Sampling can be done at any time; but if pH adjustments are necessary, test as early as possible prior to planting. Avoid sampling soils that have very recently been fertilized.

1. Soils that are distinctly different as judged by appearance, crop growth or past treatment should be sampled separately.

2. Each sample submitted for testing should be a composite or mixture of approximately 12 separate scattered samplings taken over a well-defined area.

3. Look your field or property over. Define a sample area based on uniformity of texture, slope, drainage, color, and past pest and fertility management.

4. Avoid sampling very wet soils. In soils where fertilizer has been placed in bands (rows), do not sample directly in a band. It is best not to obtain samples very near the edge of the field or plot.

5. Using a clean spade, auger, or sampling tube obtain soil from the surface through the primary rooting zone of the crop. Rooting depth will vary with crop type. For most plants the top 6-8 inches is appropriate. For established grasses sample the top 3-4 inches. 

6. Place each of the 12 randomly spaced samplings in a clean container (pail or bag) and mix thoroughly. Spread the mixture out on a clean paper to air-dry (do not place soil in an oven). 

7. Mix the soil again. Obtain a one cup measure of the soil mixture and place it in a zip-lock type bag.

8. Label the outside of the bag clearly with your name, address, and your name for the sample (ID). 

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