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Nitrogen and Tillage Effects on Irrigated Continuous Corn Yields

^a USDA-ARS, 2150 Cent. Ave., Bldg. D, Suite 100, Fort Collins, CO 80526
^b Agric. and Biol. Eng. Dep., Univ. of Florida, 281 Frazier Rogers Bldg., Museum Rd., P.O. Box 110570, Gainesville, FL 32611

View larger version (36K): [in a new window]   Fig. 1. Corn grain yields in conventional till (CT) and no-till (NT) treatments as a function of N fertilizer application rate for five crop years at Fort Collins, CO.

View larger version (39K): [in a new window]   Fig. 2. Corn grain yields in conventional till (CT) and no-till (NT) treatments as a function of plant available N [soil N (0–90 cm depth) plus fertilizer N applied] for five crop years at Fort Collins, CO.

View larger version (39K): [in a new window]   Fig. 3. Total N removed in grain from plot area in conventional till (CT) and no-till (NT) systems with increasing N rate each crop year from 2000 through 2004.

View larger version (38K): [in a new window]   Fig. 4. Amount of N removed in 1 Mg of grain as a function of N rate and year for the conventional till (CT) and no-till (NT) systems.

View larger version (28K): [in a new window]   Fig. 5. Corn residue production for conventional till (CT) and no-till (NT) systems as a function of N rate averaged over years from 2000 through 2004.

View larger version (34K): [in a new window]   Fig. 6. Corn residue N uptake as a function of N rate and year for the conventional till (CT) and no-till (NT) systems.

View larger version (42K): [in a new window]   Fig. 7. Total N uptake (grain N + residue N) as a function of N rate and year for the conventional till (CT) and no-till (NT) systems.

View larger version (37K): [in a new window]   Fig. 8. Total N requirement to produce 1 Mg of grain as a function of N rate and year for the conventional till (CT) and no-till (NT) systems.