Strawberry Glue Organic

Doesn't look like Iron to me at all, looks more like a Sulfur, which whenever you are experience micro-nutrient lockouts or immobile nutrient lockouts its most likely due to improper PH. Next step would be determining if there is enough nutes in the soil. If too many nutes, different nutrients can lock out other nutrients, in the issue of Sulfur or even Iron if we still wanna go that way, I'm most likely pointing to PH being too high.