Prepared by Richard Brzozowski, Extension professor; and Bruce Hoskins, assistant scientist of plant, soil, and environmental sciences
A routine soil test is a tool to help you manage the mineral nutrition of your growing plants. It is a quick and inexpensive way to check the levels of essential soil nutrients and check for lead contamination. You simply take a sample of your soil and send it to a lab for analysis.
Homeowners, farmers, and others often test soil from their gardens, yards, and fields. The soil tests indicate soil pH and the levels of nutrients that are available for plant growth.
The pH of the soil is a measurement of relative acidity. Soils that are too acid are not suitable for many plants. Maine soils tend to be acid.
The amount and balance of nutrients in the soil has an effect on plant growth, too. Low levels slow plant growth. High levels can pollute the environment, or cause nutrient imbalances and stress the plants. A soil test lets you know whether you need to add more nutrients and how much lime and fertilizer, if any, to add. Test results provide information that can save you money and prevent water pollution.
The soil test results will tell you
Test your soil at least once every three years. Keep the test results handy so that you can monitor any changes in soil fertility.
You may want to test more often if you have a problem area or if you’ve applied lots of nutrients. Some people test their soil every year to save money on fertilizer, lime, and other soil amendments. How often you test depends on the value of your crop and how closely you manage it.
The results of your soil test give recommendations for the next growing season, so you should test soil well before the growing season, such as in early spring after the frost is out of the soil, or in the fall before the ground freezes. A soil test usually takes two to three weeks (from shipping to the lab to return of results). The results will be the same whether you test in spring or in fall, but with fall sampling, you will get results back in plenty of time for planting.
When you get them back, the results of your soil test will include recommendations on how to improve your soil. To help you understand your results, the Maine Soil Testing Service offers “Interpreting Soil Test Results for Gardens and Grounds.”
If you have any additional questions, contact your UMaine Extension county office. Your county office will automatically receive a copy of your soil test results from the lab, so a specialist or educator in that office can easily go over your results with you over the phone.
Information in this publication is provided purely for educational purposes. No responsibility is assumed for any problems associated with the use of products or services mentioned. No endorsement of products or companies is intended, nor is criticism of unnamed products or companies implied.
© 1994, 2008
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