"Possible" cause.Let me interject here for a second GTR.....if i may......so if each of the minerals on the left is the cause, how did the minerals on the right get affected? Are they usually lower or higher? And if so, how do you lower or higher their Trace Amounts in your soil?
It's a trouble shooting tool only meant to aid in the elimination of possibilities. The column on the left shows the minerals which, if in excess, will affect the plant's ability to absorb the minerals listed in the right column. For example, if you have a nitrogen deficiency, and you have been feeding your plants all along, then it is possible that they are getting too much potassium, and the nitrogen is being locked out, or at least inhibited to some degree. Calcium deficiency could be almost anything.
Personally, I've always found that keeping the PPM low and not being greedy(trying to squeeze out every half a gram I possibly can), avoids a whole world of problems.