Almost all soils east of the Rockies are deficient in Boron. Without it broccoli and cauliflower will get hollow stem to some degree. If the insides of the hollow stem are tinged with a brown or rusty color, then you are very deficient. It also sets up crops for other diseases that they might have fought off if they were in better health.
DH is my fertilizer person and he's busy right now, but I got out of him that 14 lbs / ac of the 14% Boron products is what we put down every year. We get it at a local farm Co-op but you can use plain old Borax for smaller areas. Borax is in the 10-12 % range so you would need a bit more / ac.
Carol
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