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Challenging Approaches to Nitrogen Fertilizer Recommendations in Continuous Cropping Systems in the Great Plains

^a Southwest Res.-Ext. Cent., Kansas State Univ., Tribune, KS 67879
^b Agric. and Agri-Food Canada, Brandon Res. Cent., Brandon, MB
^c Dep. of Soil Sci., North Carolina State Univ., Raleigh, NC

View larger version (50K): [in a new window]   Fig. 1. Fertilizer N requirement for wheat in continuous wheat (WW) and wheat–lentil (W-L) cropping systems at Swift Current, SK (Zentner et al., 2001).

View larger version (35K): [in a new window]   Fig. 2. Annualized grain yield for continuous and fallow wheat on five soil types in Canada (adapted from Campbell et al., 1990). WF indicates wheat–fallow rotation, and WW indicates continuous wheat.