Are they necessary? Depends on what you mean. I used to grow lots of tomatoes in containers using only foliar mg, but that was a long time ago. Now I believe that you need some slow release in to make sure your level of fertilization is steady and available for the plants when they want it. You can use osmocoate or tomato tone etc. I use a litle osmocoate because it breaks down slowly and a fair amount of tomato tone.
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Michael
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