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I am planning to make a simple DWC set up (for tomatoes) and was wondering if I could use a water soluble fertilizer (20-20-20 with Mg Fe Cu etc.) It depends what is in that "etc". If all 13 required elements are present, then you could probably use that fertilizer. However, if it isn't made for hydroponics, it probably won't have them, since in soil ...


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"Cow dung cake" would be a "cow pattie" here in the northern US. :) I think that the dung might be the issue. Manure that is too fresh (even dried but not composted), can be too "hot" for the plant; that is, it provides way too much nitrogen and/or dehydrates the plant as it decomposes. You should only use composted manures for your plants. The other issue ...


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