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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.

Current Topic

NITROGEN ISSUES SO FAR THIS SPRING

John Sawyer, Department of Agronomy, Iowa State University
June 5, 2015

Across the state, generally there has not been excessive precipitation and much of Iowa has been below normal the past 60 days. A few areas have received more than normal precipitation, mostly in Western to Southwestern Iowa, some isolated areas in Central to North Central Iowa, and very eastern Iowa (see maps).

So far this spring there have not been many weather-related issues with nitrogen (N) management, unlike recent years. There have been a few reports of damage to corn seedlings from spring applied anhydrous ammonia. However, precipitation has kept soils moist this spring which reduced damage potential. Read on.


Past Current Topics

 

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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