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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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It's time to get your soil tested. You tested most of what that is to be tested. The the biggest reason for fruit drop is some sort of nutrient deficiency. I had suggest you use a Citrus or Palm Tree fertiliser because they have higher amount of certain micro-nutrient, but now I think you might as well test your soils before you go adding more fertiliser ...


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