Typically, purple corn leaves are automatically diagnosed as a phosphorus deficiency early in the spring. Although purple corn leaves are a symptom of phosphorus deficiency, this does not always mean there is a soil phosphorus deficiency per se. It could be that the plants are unable to access soil phosphorus due to problems with the root system, excess soil moisture, or cool temperatures.
Categories: Agronomy, Agronomy Talk
Tags: sidewall compaction, purple corn. phosphorus deficiency, corn root system