Beware of commercial composts and potting mixes that contain "biosoilds" which is a marketing term for processed human feces.
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Potassium Chloride (Muriate of Potash)
Micronutrient values may show a zero value for missing data. Over time the dataset will improve, but keep in mind that in some instances; especially with natural materials, the listed values given are rough estimates and will vary with samples from different sources.