Is this ok!!!!

I'm using shultz 10-15-10 my plants are in mg soil and i believe the nutes ran out out were locked out because my plants were beginning to get Brown rust looking spots on there leaves and turning light green and yellow rather than the usual dark green so I'm flushing them now and I did some foliage feeding and tips or info would be great like how often u should foliage feed and should I also add the nutes to the water when I do it.
 
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