Got out the calculator, 5 lbs zinc sulfate at the MAXIMUM dose rate, would
cover 2420 sq ft or a 49 x 49 ft square. Hmmm... this is interesting. We
tend to be a bit short of zinc here, just a little, so if I could find a 5 #
bag, I could probably spread it very thinly over garden and around young
fruit trees for a MUCH lower dose. I'll be doing about the same for boron,
not something you want to overdo. My compost will not be spread evenly, so
I wouldn't dare do it that way.