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.
NITROGEN LOSS – SPRING 2013
John Sawyer, Professor, Department of Agronomy, Iowa State University
June 10, 2013
Dry soils across Iowa from deficit precipitation following the drought in 2012 have changed to
excess wetness this spring. Unfortunately, precipitation to replenish subsoil moisture has been
much more than needed. As I wrote in an ICM News article earlier this spring, one downside to the
excess precipitation has been movement of carryover nitrate deeper into the profile, and to tile
lines resulting in high nitrate-N concentrations in surface waters. This means there is less nitrate-
N carryover to be utilized by 2013 crops, although as noted in the previous article, not all of the
carryover N moved below the three-foot depth. Read on.
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DO YOU KNOW THE STORY OF SOIL?
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