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[1] https://extension.umd.edu/sites/extension.umd.edu/files/_images/programs/hgic/Publications/HG42_Soil_Amendments_and_Fertilizers.pdf: https://extension.umd.edu/sites/extension.umd.edu/files/_images/programs/hgic/Publications/HG42_Soil_Amendments_and_Fertilizers.pdf
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1 Comment To "why would potassium be high in soil test when no amendments have ever been added to area?"
#1 Comment By Downtoearthdigs On 07/30/2019 @ 7:51 am
As with all beneficial soil components, too much potassium can be detrimental to plant growth, as it interferes with the uptake of other substances.
If a soil test indicates a high level of potassium, literally start from the ground up by not adding more to it in the form of a multipurpose fertilizer. Typical fertilizer blends are generally composed of the three most important substances — nitrogen, phosphorus and potassium — which are indicated on the packaging by the letters N, P and K. Selecting a blend that is low in potassium, or K, or contains none at all, is a first step in assuring that it doesn’t build up to unsuitable levels in the soil.
If a soil test indicates a high level of potassium, literally start from the ground up by not adding more to it in the form of a multipurpose fertilizer.
Schedule any fertilizing within several weeks before planting, so that the potassium doesn’t have time to accumulate during the off-season. To minimize long-term potassium buildup, consider using aged or composted animal manure as a substitute for commercial fertilizers, as its components break down more slowly to keep up with plant demand. If using manure, apply it at a rate of 40 pounds for every 100 feet, and work it into the soil to a depth of 6 to 9 inches.
https://extension.umd.edu/sites/extension.umd.edu/files/_images/programs/hgic/Publications/HG42_Soil_Amendments_and_Fertilizers.pdf [1]