Toxcicity or deficiency?

I'm currently in my first grow. I'm outdoors gorrilla growing. Bottom third of my holes are subcool super soil and rest is a base I made out of composted horse manure, perlite and peat moss. Plants have been growing good with no problems since June first when they were put in the ground. A week ago I top dressed them with some Epsom garden tone and a little kelp meal and when I came back yesterday Ive got quite a few yellowing and dead leaves as seen in the pictures. The only plants that look to be affected are the Columbian gold strains. I have some green crack, super silver haze, kwazulu, and an eleven roses that are all looking good to me. Which I also have in the pics to see the difference. I was hoping someone could help me diagnose the problem. Thanks! (Also I have been watering using pond and rain water once a week if they dont get any rain)
 

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