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Nitrogen Management Strategies to Reduce Nitrate Leaching in Tile-Drained Midwestern Soils

USDA-ARS Natl. Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011

View larger version (28K): [in a new window]   Fig. 1. Average U.S. commercial N fertilizer use for corn production for the years 1964–1998.

View larger version (23K): [in a new window]   Fig. 2. Average commercial N fertilizer use in the Midwest for corn production for the years 1991–1997.

View larger version (42K): [in a new window]   Fig. 3. General seasonal patterns for precipitation, N uptake rate by a corn crop, cropping system water use, and periods potentially favorable for NO3 leaching from midwestern corn production (adapted from Fig. 4 of Power et al., 1998).