Aquaponic Gardening

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Hey all, first time on here. Leaves on mainly  fruiting plants have started to yellow with the veins still dark green, and edges of leaves are brown or almost burnt looking. Sounds like I need to supplement.  Bought Potassium 0-0-50- Sulfur17%.   I have a 500gal. system. Just have no idea how much to use. Any help would be great Thanks

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That sounds like iron to me, start with a few teaspoons of Chelated Iron (in a tote system) and watch for results in a week or two.  You would really have to dump a lot of Iron on to become toxic so don't worry about killing things.  Before we can really help, we'll need to know how big your system and what you are growing.

good luck

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