Crop Nutrition

Sulfur Recommendations in Iowa

Robert Mullen, Ph.D.

Robert Mullen

Robert Mullen, Ph.D.


Director of Agronomy

To say Dr. Robert Mullen is passionate about agriculture would be an understatement. He holds a Bachelor of Science degree in ag business from Cameron University, along with a Master of Science degree in plant and soil science and a Ph.D. in soil science from Oklahoma State University. In addition, Dr. Mullen has been published in a variety of scientific and trade journals. But it’s not just his academic accomplishments that make him unique. It’s his unwavering ability to take complex data and — in simple terms — explain how it impacts a farmer’s bottom line. Dr. Mullen delivers the kind of insightful observations that can lead to a more profitable business. As a leading agronomy expert, Dr. Mullen has a goal to further educate farmers on best management practices that improve their yields and maximize their return on investment.

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Iowa State University just published an article on sulfur nutrition considerations this spring. They report that over the last 15 years over 150 field trials have been conducted with approximately 50 percent of those trials showing a sulfur response. Additionally, the report illustrates the challenge of soil-based approaches to identifying sulfur responsive sites (a common problem across much of the central and eastern Corn Belt). 

The general fertilization guidelines are 15 pounds per acre for fine-textured soils, and 25 pounds per acre for coarse-textured soils. The authors also state that corn has been more responsive to sulfur than soybean in their field studies.

You can find the full article here.