Recently as I have been out in the county I have seen some corn with nutrient deficiency symptoms. Below are some pictures of several corn nutrient deficiencies.
The following pictures are of corn Nitrogen deficiency symptoms. You see a V-shaped yellowing that starts on the bottom leaves of the plant.
The following pictures are of a corn Sulfur deficiency. You can see the yellow striping on the leaf. That striping effect is the sign of a sulfur deficiency.
The following picture is a Phosphorus deficiency. Purple leaves are an indicator of a phosphorus deficiency.
The following pictures are of Potassium deficiency symptoms. In potassium deficiency there is a yellowing of the outer leaf margins that begins on the lower leaves.