Help! yellowing on leaves

Leaves have been yellowing, shriveling up and just basically dying? I have another one exactly like it (another clone) that is healthy as hell and getting same amount of nutes + water etc. The only difference is the soil. The good one is in fox farms, this one is in some unknown organic mix.

Have you tried checking the pH in the unknown soil?

I'm no pro when it comes to pH or growing but you might want to monitor the pH in the unknown.

looks like a sativa at arounf week 7 of flowering. the gals are getting deficient, normal if u were at the end of flowering. But I must say, most people over fert the sativas so doesnt look like you did that. next time continue your veg formula couple weeks into flowering. for now, if you have more than 2 weeks to go, you can give em some veg formula containing N along with your a slightly higher level of ur bloom ferts. at this stage, ur goal is to prevent immature yellowing of the fan bud leaves.