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**To**:**<Aquatic-Plants at actwin_com>****Subject**:**Ratios****From**:**"Tom Wood" <tomwood2 at flash_net>**- Date: Sun, 2 Sep 2001 15:40:42 -0500

I've wondered if it might be useful to think in terms of ratios when dosing NPK. To that end, I asked one of the list botanists what ratio these elements were found in plant tissue. He answered: "An average N:P:K ratio, based on the composition of leaves, would be about 16:1:8." Then I asked a list chemist to help me with the math to get to that ratio: N - KNO3 MW=101 g/mol N=14% P - NaH2PO4 (Discus Buffer) MW=120 g/mol P=26% K - K2SO4 MW=174 g/mol K=44% KNO3 =26/14x16=30, MSP=1, K2SO4=26/44x8=4.7, so you would add these in a 30:1:5 (roughly) ratio to get a 16:1:8 N:P:K ratio." Is it just me, or does that calculation not account for the K in the KNO3? So, if I mixed a powder of the compounds above, in the ratio shown above, and set the dosing level by measuring N (or NO3), then I should be able to provide these nutrients in the right ratio. I suspect that I can delete the P since I feed heavily. Any thoughts? Tom Wood Austin, Texas

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