this post was submitted on 17 Jul 2023
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Composting
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What are the four vials for? N, P, K and S?
You would get much better results sending a sample to the lab for about the same price as what you paid for this kit.
Most labs I've dealt with charge between $25 to $80 per sample, with the average price in the $25 to $50 range.
I agree sending it off would yield better results, but this kit was like $11 and does N, P, K, pH x10