What is a common symptom of potassium deficiency in corn?

A common symptom of potassium deficiency in corn is necrosis occurring on lower leaves. Potassium is essential for various plant functions, including photosynthesis, osmoregulation, and enzyme activation. When there is insufficient potassium, older leaves are affected first because potassium is mobile within the plant, causing the deficiency symptoms to manifest in older tissues as they are unable to function properly.

As the deficiency progresses, these older leaves often show signs of necrosis—browning and dying off at the tips or edges—due to impaired metabolic functions. This type of leaf damage is particularly notable in potassium-deficient corn, where it can lead to reduced crop yields if not addressed. Other signs of potassium deficiency may include mottling, striping, or chlorosis, but necrosis specifically indicates a more advanced deficiency requiring attention.