Waiting for TechGuy to respond. I'm curious as to what the lab sees as sufficient boron levels in the tissue analysis for tomato and what reasons why there may be a lack Boron in his soils. I know micronutrients like Boron are important and there are limiting factors that lead to very low levels of B in some soils, but there are always plant symptoms that reflect a deficiency and a need to correct it.
Everything I've read about Boron includes the same warnings about the narrow margin between B sufficiency and toxicity.
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