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Irrigated Corn and Soybean Response to Nitrogen under No-Till in Northern Colorado

USDA-ARS, 2150 Centre Ave, Bldg. D, Suite 100, Fort Collins, CO 80526

View larger version (35K): [in a new window]   Fig. 1. Corn grain yields in an irrigated, no-till corn–bean rotation as a function of N fertilizer application rate for three crop years near Fort Collins, CO.

View larger version (32K): [in a new window]   Fig. 2. Corn grain yields in an irrigated, no-till corn–soybean rotation (NT-CB) compared to no-till and conventional-till continuous corn (NT-CC and CT-CC, respectively) (Halvorson et al., 2006) as a function of N fertilizer rate averaged over 3 yr near Fort Collins, CO.

View larger version (41K): [in a new window]   Fig. 3. Corn grain yields in an irrigated, no-till corn–bean rotation as a function of plant available N [soil N (0–90 cm depth) + fertilizer N + irrigation water N] for three crop years near Fort Collins, CO.

View larger version (34K): [in a new window]   Fig. 4. Total N removed by corn grain in an irrigated, no-till corn–bean rotation with increasing N rate for 3 yr.

View larger version (26K): [in a new window]   Fig. 5. Corn residue production and residue N uptake in an irrigated, no-till corn–bean rotation as a function of N rate averaged over years (2002 and 2004).

View larger version (32K): [in a new window]   Fig. 6. Total N uptake (grain N + residue N) by corn as a function of N rate and year in an irrigated, no-till corn–bean rotation.