yellow leaves on first week of flower

i grow marijuana from a clone plants seem to be healthy up until i induce them to flower and all the large fan leaves seem to turn yellow every time within the first week of flower what could be the problem.
 

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never had a chance to reduce before leaves yellowed. i fertilized up until two days before inducing flower 12/12 cycle. within three days of inducing flower the leaves started to change
 

max316420

Well-Known Member
You my good sir are experiencing a magnesium def, calmag will stop the progression of yellowing leaves.
 
just added a 15-30-15 mg 1/8 tsp. and will see in a couple days how she is doing also did a foliar spray of epson salt 1 tbls. per gallon
 
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