Nitrogen can have a great impact on a grower’s success and identifying nitrogen deficiency and its cause can be critical. Severe nitrogen deficiency will result in a yellow colored V on the leaves of the corn plant. Since nitrogen is a mobile nutrient, symptoms will begin in the lower leaves and move up the plant. Soybean leaves will also appear pale green to yellowish with dark green veins.
Cold or saturated soils, dry soil, particularly after the mid-season; large amounts of low nitrogen residue, sandy soils, inadequate fertilization, leaching from heavy rainfall, excessive rains, and ponding/flooding.
What to look for:
Corn: stunted, spindly plants with light green or yellowish color. V shaped yellowing of the lower leaves starting at the leaf tips, the entire leaf will eventually turn brown and wither.
Soybeans: poor modulation of roots, stunted spindly plants with a light green color which will appear on the first leaves.