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post #1 of 4 (permalink) Old 06-09-2015, 01:26 AM Thread Starter
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substituting for KNo3

I am starting to dose ferts on the EI schedule but one of my tanks has enough bio load that I may want to skip the nitrogen and add more
K from either K2SO4 or KH2PO4. So which one would I increase and how much additional if I would have dosed 3/4 tsp of KNO3?
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post #2 of 4 (permalink) Old 06-09-2015, 02:47 AM
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Ive been in that boat for a couple years now. I'd only dose extra k2so4 if you need to dose any extra at all, you may not need to. If you do, you shouldn't need to dose more than double what ei calls for. There are quite a few calculators around that will do the math for you but thats generally how I've handled it. Just watch the plants, if they start showing potassium deficiency than add more k2so4 and there's your baseline ^^

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post #3 of 4 (permalink) Old 06-09-2015, 03:30 AM
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Use the K2SO4..... to get a meaningful increase in potassium using KH2PO4 will supply far too much PO4....

By mass, K2SO4 is 45% potassium, and KNO3 is 39% potassium.
Assuming a teaspoon of each has the same mass (can't be too far off) - you will get the same mass of potassium found in 3/4 teasp KNO3 in 2/3 teasp of K2SO4.
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post #4 of 4 (permalink) Old 06-09-2015, 03:02 PM Thread Starter
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Thanks, that makes sense.
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