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[APD] Preparing Control Sample to Determine Accuracy of K Test Kit

I have purchased a Lamotte Potassium test kit. I have also aquired an 0-0-3
fertilizer. The container size is 237ml. As I undersand the analysis 3% of
237ml would be K. I would like to determine how much of this fertilizer
would need to be added to a gallon of water to create a sample that should
read 20ppm when tested. Anyone have experience with this type of
calculation? Thanks, Chas.

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