Meta-analysis of Enhanced Efficiency Fertilizers in Corn Systems in the Midwest

Enhanced efficiency fertilizers can be an effective means of managing nitrogen to prevent losses to the environment, both to protect natural resources and improve crop yields. However, the range of environmental and management factors that can influence their success can be difficult to put into context. This meta-analysis will help growers, industry, and academics by compiling the most up-to-date information and move the concept of 4R nutrient stewardship and sustainable agriculture forward.


Introduction The 4R approach to nutrient stewardship has helped develop a better context for driving best management practices in production agriculture. As the agricultural community becomes more involved in exploring the three aspects of sustainability, including the economic, social, and environmental triple bottom line, the 4Rs (right source, right rate, right time, and right place) provide a framework for better management of fertilizer applications. Read more

Year of initiation:2014
Year of completion:?

Interpretive Summary


Enhanced efficiency fertilizers (EEF) such as nitrification inhibitors, urease inhibitors, and polymer-coated fertilizers may provide environmental and agronomic benefits in nitrogen fertilization of corn. Their effectiveness, however, can be influenced by fertilizer source, rate, application time, and placement and can vary by location due to climate and soil characteristics.

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Project Description

Project Leader

Rachel Cook, Southern Illinois University

Project Cooperators

Jeff Wolt, Iowa State University
Andrew Trlica, Southern Illinois University

IPNI Staff

S. Phillips


Americas \ Northern America \ USA \ Illinois


4r research fund


Nitrogen (N)