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You're so clueless that you don't even comprehend that "lock out" can mean different things, at different times, with different nutrients being locked out by different other nutrients, You think it's a specific thing that happens and this specific photo is what looks like. You just googled 'lock out" and posted a photo that you found, you are some sort of weird troll. Lol
Calcium and magnesium each play roles in like 3 or 4 other MAJOR functions in a plant. If theyre not available the macros will certainly show it.