LaMotte PLANT TISSUE TEST KIT PT-3R - Manual (Page 4)

PO TAS SIUM (POT ASH) TEST
1.
Fill the “Potash A” Tube (0245) to the lower line with the filtered
tissue extract.
2. Add one *Potassium Reagent B Tablet (5161). Cap and shake until
tablet dissolves.
3. Use the transfer pipet (0364) to add *Potassium Reagent C (5162)
until the tube is filled to the upper line. Allow the *Potassium
Reagent C to run slowly down the side of the tube. Swirl tube gently
to mix. A precipitate indicates the presence of potassium. The
heavier the precipitate, the more potassium is present. Compare
formation of precipitate in healthy plant tests and problem plant
tests.
Results:
Heavy Precipitate Adequate to
Abundant potassium (potash)
Medium Precipitate Possible potassium deficiency
Trace Precipitate Deficient potassium
No Precipitate Extremely Deficient potassium
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