boron supplement question

[swamper]

It turns out I have a deficiency of boron in my garden soil. All other nutrients tested out well, pH was a tad high, and my soil is sandy so that triggers it. I noticed beets have been growing poorly, and some of the greens have not been up to par.

Any suggestions for supplementation? I notice boric acid is readily available and cheap and was thinking of a very dilute watering with some dissolved before planting season. I don't want to spend more than I have to as I think most of my soil minerals are in good shape.

i know how to calculate how much to use per 1000 ft2 and it wont be much.

I'm wondering if anybody has experience supplementing with soluble boron while plants are growing or experiences with toxicity from overapplying? I'm thinking specifically garlic since it's the only thing growing now, but also perhaps a preseason and midseason supplementation for tomatoes and peppers etc

serious replies only please or I've already taken "Boron for Morons" out of the local library...