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Sweet Corn

Sweet corn accounts for about 260,000 acres of crops grown in the United States. Sweet corn is a variety of corn with a higher concentration of sugar in the ear. Once planted, sweet corn is usually ready for harvest around 60-100 days. Compared to field corn, sweet corn is harvested earlier at the R3 growth stage, while field corn is harvested at the R6 growth stage when the crop has reached maturity.  

A sweet corn crop is very susceptible to nutrient deficiencies which result in loss of crop quality and reduction of overall yield. To maximize quality and yield, sweet corn requires the application of various nutrients throughout the season.  

Use the images below to diagnose nutrient deficiencies in your sweet corn fields. 

Nutrient Deficiencies

Nitrogen
Nitrogen is mobile in the plant. Symptoms will appear as chlorosis first on lower leaves.
Photo Source
Phosphorous
Phosphorus is mobile in the plant. Symptoms will appear as purpling in a young corn plant first on lower leaves. Some hybrids appear purple at the seedling stage so a tissue test is essential for proper diagnosis.
Photo Source
Potassium
Potassium is mobile within the plant, causing deficiency symptoms to appear first in older leaves. Leaf symptoms appear as yellowing to necrosis on the outer edge of leaves.
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Sulfur
Sulfur is immobile in the plant. Symptoms of interveinal yellowing and leaf striping will appear on the younger leaves. Plants will appear stunted and light green in appearance. Normally will see sulfur deficiencies on sandy soils
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Zinc
Zinc is immobile in the plant. Symptoms of white interveinal striping while midribs stay green and shortened internodes. Symptoms will appear on the younger leaves. Conditions that favor zinc deficient plants high phosphorus and pH soils, root limiting conditions.
Photo Source
Boron
Boron improves seed set under stressful conditions and is an important component of cell walls. Symptoms will appear as brittle leaves and small dead spots.
Photo Source

Additional Resources

2020-01 Specialty Products Guide
2020 Research Trials Brochure
Biological Solutions Brochure
Technical Bulletin 05: Low-Salt Foliar Program | Corn
Technical Bulletin 069: Soil Tests Offer Guidance
Technical Bulletin 071: First Roots Need Nutrients Fast
Tune Up Your Soil: Pelletized Limestone & Gypsum Products
Top 10 reasons to add Bio Pass to your liquid starter fertilizer
Update from the Field: Mighty Micronutrients
Podcast: How to Stabilize Nitrogen

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