Comparison of the MRTN and Adapt-N derived N rates for corn
Nitrogen application to corn is a large determinant for high yield, and rate has important implications for economic profitability and off-field movement of nitrate-N. Nitrogen rate recommendation systems have varied over time. A popular system was yield-goal based, with grain yield multiplied by a per-bushel factor and then rate adjusted for previous crop and other N inputs. Modifications of this system are still used today in some states. Seasonal (site-year) variability in economic optimum N rate (EONR) has been widely recognized. However, to date there has been no recommendation system that provides a solution to accurately predict EONR.
This is a proceeding from 43rd North Central Extension-Industry Soil Fertility Conference 29 (2013): 60. Posted with permission.