I find this to be a shame:
"Boron requirements vary greatly from crop to crop. Rates
required for responsive crops such as alfalfa, celery,
sugar beets and table beets can cause serious damage to
small grains, beans, peas and cucumbers."
I guess that means there isn't some average Boron level that would work
with just about all crops. It makes me wonder how I managed to grow
beets and cucumbers withing several feet of each other in the same garden.
I wonder where apples, pears, and plums fit into the Boron preference
charts?