Leaves yellowing with brown spots

leafs at the bottoms of my plants are turning yellow and further up on another there is brown spots what is the cause?
 

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You'll need to post more details and pictures, please read the forum rules. However it sounds like Mg-Ca deficiency. But please, other people with the same problem read this threads to look for help and they'd want to compare, so be please be wary.
 
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