Previous research has shown that corn greenness in aerial photographs is related to the amount of N needed. However, interference from soil color is an obstacle. Waiting until canopy development minimizes soil interference is the simplest solution. Unfortunately, at this canopy stage, additional N can be applied only with high-clearance applicators, airplanes, or irrigation systems. Nitrogen application through pivot irrigation is inexpensive and is ideally suited to use aerial photos to guide decisions about N application rates. The economic potential of this system is maximized if early-season N rates are modest. One demonstration was conducted in 2006, and the producer saved $4000 in fertilizer costs while losing only 84 bu of estimated yield. Six demonstrations are planned for 2007 and will be included in this presentation.