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Nitrogen watch 2009
Nitrogen Watch 2009 is no longer being updated. Few if any corn fields can still get profitable applications of rescue N. The final version of the N Watch feature for 2009 is archived here.
Rainfall data and my observations suggest that nitrogen loss was again a big problem in Missouri and nearby states this year (Illinois, Indiana, Kentucky, Arkansas, Tennessee, Kansas…). An excessively wet spring and early summer created conditions where loss of soil and fertilizer N (especially preplant applications) could be substantial, leading to large yield losses. The maps below show ‘danger areas’ for loss of N and corn yield:
Nitrogen watch for poorly- and somewhat poorly-drained soils:
Missouri
Midwest (including aerial photos and estimated yield loss maps)
Nitrogen watch for well- and moderately well-drained soils:
Missouri
Midwest