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Soil Fertility

Questions? Contact John Sawyer

Professor
Extension Soil Fertility Specialist
Phone: (515) 294-7078
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.

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Current Topic

CORN NITROGEN RATE CALCULATOR WEBSITE - 2017 UPDATE

Antonio Mallarino, Professor, Department of Agronomy, Iowa State University
March 27, 2017

The regional Corn Nitrogen Rate Calculator (CNRC) website was recently updated with a revised Iowa N response trial database. Last year the CNRC website was updated and the url changed to (http://cnrc.agron.iastate.edu/). The ISU Extension and Outreach publication CROP 3073 (Nitrogen Use in Iowa Corn Production) will be updated in the near future to reflect the change in N rate guidelines for Iowa. Other states are also updating databases, and those changes have been made for some states or will occur in the future for others. Read on.


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DO YOU KNOW THE STORY OF SOIL?

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Do you know The Story of Soil? Human Health Food Quality Water

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

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

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