In order to receive the most accurate soil test results, you will want to wait about 5 weeks after your last fertilizer application to take your soil sample.
Pre-emergents and bio-stimulants will not have a big impact on soil test results, however, they can contain small amounts of potassium and/or micronutrients. If you are wanting to absolutely know what is naturally in the soil and not part of the products you are applying, then we recommend waiting at least 5 weeks after these applications as well.
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