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Soybeans are the second most common crop grown in the United States with about 85 million acres of land dedicated to growing it. Once the soybean crop is harvested, it is processed to make various products such as biodiesel, cooking oil, soy milk, and many other products.

To reach maturity and maximize yield, soybeans require various nutrients throughout the growing season. On average, 1 bushel of grain requires 3.8 pounds of nitrogen, 0.8 pounds of phosphorous and 1.5 pounds of potassium (Iowa State University). As a result, nutrient requirements directly correlate to yield. In 2020, the average soybean yield was 50.2 bushels per acre, with United States soybean production totaling 4.14 billion bushels (USDA). We offer numerous solutions to help the soybean crop meet its top potential.

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

Nutrient Deficiencies

Nitrogen is an essential component of vitamins, amino acids, and energy systems. Symptoms appear as uniform yellowing of lower leaves.
Phosphorus is responsible for capturing and converting the sun’s energy. Plants deficient in phosphorus are smaller with slow and stunted growth.
Potassium is mobile in the plant. Symptoms of yellowing leaf margins will appear in the older leaves and stunted, slow growth of the soybean plant.
Sulfur appears in every living cell and is important for photosynthesis. Plants deficient in sulfur will be stunted and pale green in color.
Manganese is immobile in the soybean plant. Symptoms of interveinal yellowing will occur on the youngest leaves first, as well as stunting of the plant with shorten internodes. Conditions that favor manganese deficiency would be high organic matter soils.
The availability of zinc decreases as soil pH increases. Zinc aids in the synthesis of plant-growth substances and enzyme systems. Symptoms appear as yellow or bronze coloration of leaf edges and tips.

Additional Resources

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