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Soil Fertility

Questions? Contact John Sawyer

Professor
Extension Soil Fertility Specialist
Phone: (515) 294-1923
Fax: (515) 294-9985
Email: jsawyer@iastate.edu

Antonio Mallarino

Professor, Soil Fertility
Phone: (515) 294-6200
Fax: (515) 294-2458
Email: apmallar@iastate.edu

Soil Fertility Home Page

Welcome to the Iowa State University Agronomy Extension Soil Fertility Home Page. Nutrient topics are listed on the left side. Simply click on a topic of interest and you can find information about that topic, including Extension publications, newsletter articles, conference proceedings and reports, presentations, and links to other related sites. Links also provide access to soil fertility decision aid tools, a photo gallery, and the ISU Soil and Plant Analysis Laboratory.

Current Topic

It's a Late Spring: Should You Apply Nitrogen or Plant Corn?

John Sawyer, Professor, Department of Agronomy, Iowa State University
Roger Elmore, Professor, Department of Agronomy, Iowa State University
May 5, 2008

Many areas of Iowa have wet soils and corn planting continues to be delayed. At the end of the first week in May last year we had more that 50 percent of the crop planted. Although the new report is not yet released at the time of this writing, we expect considerably less progress than that. Read on.

 

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Iron chlorosis symptom - soybean. Photo © John E. Sawyer

Iron chlorosis symptom - soybean. Photo © John E. Sawyer

Did you know?
In the last five years, anhydrous ammonia comprised 50 percent of nitrogen fertilizer consumed in Iowa.