The Iowa N response trial database was updated this past week with 27 additional response trials from 2006 research: 18 trials with corn following soybean and nine trials with corn following corn. There are now 164 N response trials for corn following soybean and 77 trials for corn following corn. Being able to easily update the database with recent data is one of the many advantages to this dynamic database approach for corn N rate guidelines. Having new response trial data allows rapid updating with changing hybrid genetics, rotations, and climatic conditions.