Nitrogen Losses: A Meta-analysis of 4R Nutrient Management in U.S. Corn-Based Systems

The specific aim of this meta‐analysis project was to determine the impact of 4R N management techniques on nitrous oxide (N2O) and nitrate (NO3) losses relative to corn yield. The team collected and synthesized field research data published prior to July 2014 that measured N losses as affected by 4R fertilizer N management (right rate, source, timing, and placement) in North American corn‐based cropping systems.

The specific aim of this data analysis project was to determine the impact of 4R N management on nitrous oxide (N2O) and nitrate (NO3) environmental losses relative to corn yield. Beginning in May 2014, published data were collected and summarized on 4R fertilizer N management (right rate, source, timing, and placement) in North American corn-based cropping systems.

2015 Annual Report

Project Description