Nitrogen Watch 2013
Abundant rain and snowfall in 2013 have created a risk that applied N fertilizer may be lost via leaching and denitrification, especially when applied before planting. Anhydrous ammonia applied in March or April is at least risk, but fall-applied anhydrous ammonia and other sources applied this spring before planting are at substantial risk of loss in many corn-growing areas.
This page tracks 2013 spring rainfall and identifies ‘danger areas’ that are on track to have widespread problems with N loss and deficiency in corn. This is a serious production and environmental problem that I estimate cost Midwestern corn producers 2 billion bushels total from 2008 to 2011.
Nitrogen watch for well- and moderately well-drained soils:
Nitrogen watch for poorly- and somewhat poorly-drained soils: