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I wasn't able to find fertiliser online that was simply potassium chloride and I didnt want to source my potassium chloride solution from potassium sulphate or other general NPK fertilisers for my experiment on the effect of varying K+ concentrations on a plant. maybe 50,100,250,1000 ppm solutions. Or is there another element or component of fertilisers, perhaps compounds that lead to nurtient intake that I am overlooking in my methodology

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  • $\begingroup$ If you have potassium sulfate (or carbonate) you can precipitate using Calcium salts (nitrate etc). Not all, just most. $\endgroup$
    – Polypipe Wrangler
    Apr 24 at 5:48

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the issue here is the chloride not the potassium. Potassium chloride is very soluble in water. but you could be killing your crops/garden when you spray it on.

Most plants do not tolerate much Chloride ion. With a limit of 500mg/kg of chloride in soil you will not be able to use much of this stuff.

that's wny potassium phosphates are much more desirable. the phosphate will be consumed by the plants.

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