Paul M. Cook wrote:
Well, planting season is almost here. I am going to double my tomato
crop this year. I have ready access to oyster shells and crushed
coral. How good of a calcium supplement would these make? I grow in
pots, 22 inch pots - 1 plant per pot. I'd like to just mix in a
large quantity of either into my planting soil. I did pretty good
last year using a liquid calcium supplement but it was kind of
expensive tedious. Hoping to do something cheaper and easier this
year.
Paul

I think not very good unless it goes into the mix months beforehand and even
then it's doubtful. The chunks will be too large and not dissolve
sufficiently to have much effect. Have a look at the thread on soil
amendment without digging up the yard for a detailed explanation.

David