by Chris Hicks, County Director – UT Extension-Smith County
Check out “Don’t Guess, Soil Test – Part I” here!
Knowing what nutrients are in your soil and the current pH can make a big difference in the productivity of your garden, crop, or pasture. In our last article, we discussed why it is important to sample your soil. Now, we will examine some of the specifics about the process. These are critical as the results of your test are only as good as the sample you submit.
The Where
When sampling farm fields, divide fields to be sampled into production areas (of 10 acres or less) based on uniform soil type, fertilization and management history. Sandy or eroded areas and problem areas of obviously different plant growth responses should also be sampled separately — provided the area is sufficiently large enough to be treated differently with lime or fertilizer. Collect a composite soil sample by moving through the area in a zigzag pattern, sampling at approximately 20 locations.
When sampling a lawn or garden, divide the area of interest into one or more sampling areas (from about an acre down to flower bed size), based on uniform soil type, fertilization and planting history. Collect small portions of soil from approximately 10 – 15 random locations that represent the average soil conditions of that area.
The How
Take soil samples to a depth of 6 inches by using a spade or probe. Combine each sub-sample in a clean (non-galvanized) bucket as you move through the production area. Thoroughly mix the sub-samples into one composite sample. From this composite sample remove enough soil to fill a soil sample box.
The Who
The UT Soil, Plant and Pest Center (ag.tennessee.edu/spp) has all the needed testing and mailing information. You can obtain soil test boxes from the Smith County Extension office.
The soil test report you receive will provide information on current soil conditions and recommendations for amending the soil to reach optimum productivity for your crop. If you would like to pick up some soil sample boxes, or would like more information about soil testing, stop by the UT Extension office at 125 Gordonsville Hwy in Carthage.
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