I have used MG All Purpose 24-8-16 with no problems. If you want a higher P count, then try MG Rose Fertilizer, which is 18-24-16, but I really do think higher P fertilizers don't do anything better than the all purpose types. Tomatoes grow foliage first before they make flowers. The healthier the foliage the better the plant to use the sun's energy to make fruit.
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