CaseIHpride - 6/16/2019 10:16
It’s not phos deficient. Some hybrids build up anthecyanins (type of sugar) and therefore purple up in color. If there’s poor growing conditions that suddenly turn good photosynthesis Ramps up and creates this temporary buildup of sugars that have nowhere to go because leaf area is limited. Never have seen it hurt corn and is more common in pioneer varieties.
You're lucky then. We had some corn that was stunted so bad by the purpling that it never came out of it. It was like dwarf corn with ears to match. Quit planting pioneer after that. | 
Purple corn
