AUBURN UNIVERSITY, Ala. — Give in to the spring fever and spend some time outdoors collecting soil samples for testing. The Auburn University Soil, Forage and Water Testing Laboratory offers soil testing to help growers make informed decisions about soil nutrients and composition on both the farm and in the backyard. Soil testing results can help get spring gardens off on the right foot. The lab’s recommendations help growers maintain their plants and create a more sustainable growing environment.

“Soil is the basis for nearly everything we do as gardeners, and without healthy soil, you cannot grow healthy plants,” said Mallory Kelley, an Alabama Cooperative Extension System home horticulture agent.

Collecting Soil Samples

It is important to grow plants in the right environment. Adequate soil nutrients — in addition to the correct soil type — will help gardeners create and maintain a growing environment where plants can thrive. To begin the soil testing process, pick up a soil sample kit from a county Extension office. The office will also have a form that explains how to properly collect a soil sample.

“It is best to send soil samples that are dry,” Kelley said. “Laying the soil out on newspaper to dry before sending it off is suggested. However, if you have to send a wet soil sample, make sure to seal it in a plastic bag.”

When collecting soil from the garden, flower bed, pasture or other area, Kelley said it is important to dig deep enough into the soil to collect an adequate sample. This could range from 2 to 8 inches deep, depending on the types of plants or seeds growers choose to plant in a given area. It is also important to include only soil in the sample by removing as much plant residue and debris as possible.

Soil Test Results

Soil tests determine the pH and nutrient content of soil. This is beneficial, as different plants often thrive in different pH ranges and require different nutrient concentrations. It is also advantageous to know soil nutrient levels, including calcium, magnesium, phosphorous and potassium. These levels will help growers make informed decisions regarding fertilizer types and frequency. Growers can also do an analysis to test levels of micronutrients, such as zinc, in the soil. This analysis will include liming suggestions.

“Add lime to your soil in order to raise its pH if it is too acidic for what you are intending to grow,” Kelley said. “There will be other recommendations on the soil analysis form that is returned to you. If you don’t know how to read your soil test results, contact a home horticulture agent to help you understand what you need to get your garden and backyard in tip-top growing shape.”

Send soil samples to the Auburn University Soil, Forage and Water Testing Laboratory. The forms include the lab’s mailing address and it is also available online through the Soil, Forage and Water Testing Lab website. Each sample costs $10, with an added cost to perform a micronutrient analysis. Testing results will be available by either mail or electronically.

More Information

For more information, visit www.aces.edu. There, you can read more about soil sampling at home in the Alabama Extension publication, “Home Soil Testing: Taking a Sample.”