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Corn Response to Nitrogen Fertilization in a Soil with High Residual Nitrogen

^a USDA-ARS, 2150 Centre Ave, Bldg. D, Suite 100, Fort Collins, CO 80526
^b Colorado State Univ., Arkansas Valley Res. Cent., 27901 Rd. 21, Rocky Ford, CO 81067

View larger version (41K): [in a new window]   Fig. 1. Corn grain yields averaged over N sources as a function of plant available N [soil N (0–90 cm depth) plus fertilizer N applied] for four crop years at Rocky Ford, CO.

View larger version (38K): [in a new window]   Fig. 2. Gross economic returns minus N fertilizer costs averaged over N sources as a function of plant available N [soil N (0–90 cm depth) plus fertilizer N applied] for four crop years at Rocky Ford, CO.

View larger version (26K): [in a new window]   Fig. 3. Total cumulative corn grain yield in four crop years, averaged over N sources, as a function of total N fertilizer applied.