The last of the big 4. Potassium is one of the most stable elements in the soil. Some soils absorb potassium and make it difficult to increase test levels. Potassium is the largest of the cations needed by plants.
It is needed for photosynthesis and transport.
More info below
http://www.rainbowplantfood.com/agronomics/efu/potassium.pdf
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