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ps: dice, do you prefer gypsum over calcium nitrate? thanks.
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Yes. The calcium nitrate is also high in nitrogen. It does not
look to me like your plants need more nitrogen. The 4% in
your fertilizer is likely plenty (depending on how much
fertilizer you added, of course, but I am guessing that you
followed instructions that came with it for that). Gypsum
contains only calcium and sulfur.
In a low pH soil or container mix, say below 6.0, I might use
dolomite lime instead, or 1/2 dolomite, 1/2 gypsum.
You can see what nitrogen deficiency looks like on the
page at the URL below. It starts from the bottom leaves
and works its way up.
http://4e.plantphys.net/article.php?ch=5&id=289
If your plants do not look like that (or have a generally
light green appearance all over), they do not need more
nitrogen, so I would not use calcium nitrate for a calcium
supplement.