All I can say is AKmark knows his stuff and speaks from considerable experience. I have tried to emulate his directions for my backyard grow bag garden using master blend in 15 gal grow bags filled with Promix. After growing tomatoes in the ground for more than 40 years I've never had the productivity like I do now using his suggestions. Last season my Dester plant produced 80 tomatoes. In 2020 my German Head plant produced 63 tomatoes and my Odoriko plant produced 101 tomatoes. Never had anywhere close to this growing them in the ground. It's labor intensive since I have to water (feed) them twice a day in July and August but that is what us old retired gardeners like to do.
Dan
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Dan
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