Thank you MrS!Thanks Shed! @One Of These Days, it's K or Mg def from what I can tell. The lowers have burned and curled up, the margins are burning on the middles and lots of interveinal chlorosis. I'm leaning more to K def because there's lots of Ca and Mg from the ingredients, most likely causing a lockout. A soil analysis when making your own is critical imho. A slurry test would be in order as well since there is no way of knowing what the pH is at.