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Nitrogen Fertilization and Rotation Effects on No-Till Dryland Wheat Production

Ardell D. Halvorsona,*, David C. Nielsenb and Curtis A. Reulec

a USDA-ARS, 2150 Centre Ave, Bldg. D, Suite 100, Fort Collins, CO 80526
b USDA-ARS, Central Great Plains Res. Stn., 40335 County Road GG, Akron, CO 80720
c USDA-ARS, 2150 Centre Ave., Bldg. D, Suite 100, Fort Collins, CO 80526



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  		Fig. 1. Total winter wheat biomass production each year at crop maturity for each of the three cropping sequences as a function of N fertilizer rate, averaged over wheat–corn–fallow and wheat–sorghum–fallow rotations.

 


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  		Fig. 2. Winter wheat grain yield each year for each of the three cropping sequences as a function of N fertilizer rate, averaged over wheat–corn–fallow and wheat–sorghum–fallow rotations.

 


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  		Fig. 3. Relative winter wheat grain yield as a function of soil NO3–N (0- to 60-cm depth) plus fertilizer N rate across all years and crop rotations.

 


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  		Fig. 4. Relative winter wheat grain yield as a function of soil NO3–N (0- to 60-cm depth) plus fertilizer N rate across all years and crop rotations, excluding N levels above 100% of maximum yield each year.

 




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