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Question: The corn in this area (southern MN) looks very good, but I have noticed some plants have developed purple leaves on the mid to upper portions of the plant. What is this? And should I be concerned about it for next year’s corn?
year, it's phosphorus deficiency in your corn. I had the same problem, but soil and tissue tests and good fertilizers helped solve this problem. You can use special equipment provided by various companies, for example, http://www.aquar-system.com/. And it will help save harvest.