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How do I take a soil sample?
Plant disorders related to nutrient deficiencies or toxins can be diagnosed by laboratory analysis. A laboratory can give detailed advice customized to for a particular plant or location. Soil testing starts by taking soil samples.
- Collect soil from the root area of a plant that seems to have a disorder. Take samples from several areas and combine them. If the soil looks or feels different in several areas, take separate samples in each area. Laboratories require about one pint of soil from each area tested.
- Surface vegetation should be removes before collecting. Samples for herbicides are generally taken from the top 2 inches of soil. Salinity tests are taken from a depth of 1 to 6 inches. Samples for general purposes are generally about 12 inches deep.
- An accurate way to collect samples is to use a soil sampling tube. A shovel or hand trowel work well also. Are sure tools are clean and rust free. Air dry sample’s and mix thoroughly. Laboratories often provide sample bags, clear plastic work well also. Label each bag.
- Laboratories will ask for any pertinent information, such as plant species and soil conditions. They will also want to know how the plant was watered and cared for.
- Consult local Cooperative Extension offices for a listing of analytical laboratories.
Abiotic Disorders of Landscape Plants a Diagnostic Guide by Laurence R. Costello et al