When I first got involved with this hobby, I use a kit that measured: pH, N, P, and K, individually. It came with a booklet to keep track of test readings.
According to the instructions, N-P-K should all be approximately equal. By keeping track, one can maintain the N-P-K by adding only whichever nutrient needed.
Great theory. Probably works,...for someone with more patience and diligence, than I. I begin logs, journals, and such, but, seldom do I see them through.
I didn't keep up with it so, no results to share.
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